SCIENCE - GLOSSARY - FOURTH GRADE
Abiotic http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=abiotic Absorption http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=absorption Adaptation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=adaptation Air mass http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=air mass Amplitude http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=amplitude Anemometer http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=anemometer Angiosperm http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=angiosperm Artery http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=artery Atom http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=atom Axis http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=axis Bacteria http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=bacteria Balance http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=balance Barometer http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=barometer Basic needs http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=basic needs Bedrock http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=bedrock Biotic http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=biotic Bone http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=bone Capillary http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=capillary Carnivore http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=carnivore Cell http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=cell Cell membrane http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=cell membrane Cell wall http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=cell wall Cell membrane http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=cell membrane Cell wall http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=cell wall Change of state http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=change of state Chemical change http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=chemical change Chemical energy http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=chemical energy Chemical property http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=chemical property Chemical reaction http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=chemical reaction Classify http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=classify Clay http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=clay Cold front http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=cold front Comet http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=comet Community http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=community Compound http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=compound Condensation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=condensation Conduction http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=conduction Conductor http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=conductor Conservation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=conservation Constellation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=constellation Consumer http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=consumer Convection http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=convection Current electricity http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=current electricity Decomposer http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=decomposer Density http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=density Deposition http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=deposition Diaphragm http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=diaphragm Direct development http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=direct development Diversity http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=diversity Earthquake http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=earthquake Ecosystem http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=ecosystem Electromagnet http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=electromagnet Element http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=element Energy resource http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=energy resource Energy transfer http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=energy transfer Environment http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=environment Erosion http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=erosion Esophagus http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=esophagus Evaporation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=evaporation Experiment http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=experiment Extinction http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=extinction Food chain http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=food chain Food web http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=food web Force http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=force Fossil http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=fossil Fossil fuel http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=fossil fuel Fossil record http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=fossil record Frequency http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=frequency Friction http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=friction Fulcrum http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=friction Fungi http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=fungi Galaxy http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=galaxy Gas http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=gas Gene http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=gene Generator http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=generator Geothermal energy http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=geothermal energy Germinate http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=germinate Glacier http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=glacier Gravitation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=gravitation Gravity http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=gravity Habitat http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=habitat Hail http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=hail Heat http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=heat Herbivore http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=herbivore Heredity http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=heredity Hibernation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=hibernation Horizon http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=horizon Humus http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=humus Hurricane http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=hurricane Hydroelectric power http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=hydroelectric power Hypothesis http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=hypothesis Igneous rock http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=igneous rock Inclined plane http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=inclined plane Inertia http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=inertia Inference http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=inference Instinct http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=instinct Insulator http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=insulator Intensity http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=intensity Invertebrates http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=invertebrates Joint http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=joint Kinetic energy http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=kinetic energy Land form http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=landform Learned behavior http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=learned behavior Lever http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=lever Life cycle http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=life cycle Light http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=light Liquid http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=liquid Magnet http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=magnet Magnetic field http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=magnetic field Magnetic poles http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=magnetic poles Mass http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=mass Matter http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=matter Mechanical energy http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=mechanical energy Metamorphic rock http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=metamorphic rock Metamorphosis http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=metamorphosis Microscope http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=microscope Microscopic http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=microscopic Migration http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=migration Mineral http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=mineral Mineral resource http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=mineral resource Mixture http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=mixture Moon http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=moon Moon phases http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=moon phases Motion http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=motion Motor http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=motor Mountain http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=mountain Muscle http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=muscle Natural resource http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=natural resource Neuron http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=neuron Niche http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=niche Nonrenewable resource http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=nonrenewable resource Nonvascular http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=nonvascular Nucleus http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=nucleus Observation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=observation Omnivore http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=omnivore Orbit http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=orbit Organ http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=organ Organism http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=organism Parallel circuit http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=parallel circuit Phloem http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=phloem Photosynthesis http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=photosynthesis Physical change http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=physical change Physical property http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=physical property Pitch http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=pitch Planet http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=planet Pollution http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=pollution Population http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=population Position http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=position Potential energy http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=potential energy Precipitation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=precipitation Predator http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=predator Preservation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=preservation Prey http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=prey Producer http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=producer Protest http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=protist Pulley http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=pulley Radiation http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=radiation Rain http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=rain Rain shadow http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=rain shadow Red blood cell http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=red blood cell Reflection http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=reflection Refraction http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=refraction Renewable resource http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=renewable resource Resource http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=resource Rock http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=rock Rock cycle http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=rock cycle Sand http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=sand Scientific method http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=scientific method Screw http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=screw Sea breeze http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=sea breeze Sedimentary rock http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=sedimentary rock Series circuit http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=series circuit Simple machine http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=simple machine Sleet http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=sleet Snow http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=snow Solar power http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=solar power Solar system http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=solar system Solid http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=solid Solubility http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=solubility Solution http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=solution Speed http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=speed Spinal cord http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=spinal cord Spore http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=spore Spring scale http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=spring scale Standard measure http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=standard measure Star http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=star State of matter http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=state of matter Static electricity http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=static electricity Stomach http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=stomach Sun http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=sun Suspension http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=suspension Temperature http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=temperature Tissue http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=tissue Topography http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=topography Tornado http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=tornado Trait http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=trait Transmission http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=transmission Universe http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=universe Vascular http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=vascular Vascular tissue http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=vascular tissue Vein http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=vein Velocity http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=velocity Vertebrates http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=vertebrates Vibration http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=vibration Volcano http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=volcano Volume http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=volume Warm front http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=warm front Waste heat http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=waste heat Water cycle http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=water cycle Wavelength http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=wavelength Weathering http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=weathering Wedge http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=wedge Weight http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=weight Wheel and axle http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=wheel-and-axle White blood cell http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html? grade=4nl&word=white blood cell Work http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=work Xylem http://www.harcourtschool.com/glossary/science07/vocab_word_nl.html?grade=4nl&word=xylem
