Unit A
Chapter 1
1. root
2. stem
3. leaf
4. cell
5. simple plant
6. seed
7. germinate
8. seedling
9. photosynthesis
10. chlorophyll
Chapter 2
1. inherit
2. trait
3. mammal
4. bird
5. amphibian
6. gills
7. fish
8. scale
9. reptile
10. instinct
11. hibernate
12. migrate
13. camouflage
14. mimicry
15. extinct
16. species
17. endangered
18. threatened
19. fossil
Unit B
Chapter 1
1. environment
2. ecosystem
3. population
4. community
5. habitat
6. forest
7. deciduous forest
8. tropical rain forest
9. coastal forest
10. coniferous forest
11. desert
12. grassland
13. salt water
14. fresh water
Chapter 2
1. interact
2. producer
3. consumer
4. herbivore
5. carnivore
6. omnivore
7. decomposer
8. food chain
9. energy pyramid
10. food web
11. predator
12. prey
Unit C
Chapter 1
1. mineral
2. rock
3. crust
4. mantle
5. core
6. igneous rock
7. sedimentary rock
8. metamorphic rock
9. rock cycle
10. fossil
Chapter 2
1. landform
2. mountain
3. valley
4. canyon
5. plain
6. plateau
7. barrier island
8. weathering
9. erosion
10. glacier
11. earthquake
12. volcano
13. flood
Chapter 3
1. soil
2. humus
3. topsoil
4. bedrock
5. clay
6. loam
7. resource
8. conservation
9. strip cropping
10. contour plowing
Chapter 4
1. resource
2. renewable resource
3. reusable resource
4. nonrenewable resource
5. recycle
Unit D
Chapter 1
1. groundwater
2. estuary
3. evaporation
4. condensation
5. precipitation
6. water cycle
Chapter 2
1. atmosphere
2. weather
3. temperature
4. front
5. wind
6. anemometer
7. weather map
Chapter 3
1. solar system
2. orbit
3. planet
4. asteroid
5. comet
6. rotation
7. axis
8. revolution
9. phases
10. lunar eclipse
11. solar eclipse
Unit E
Chapter 1
1. matter
2. physical property
3. solid
4. liquid
5. gas
6. atom
7. evaporation
8. volume
9. mass
Chapter 2
1. physical change
2. mixture
3. solution
4. chemical change
Unit F
Chapter 1
1. energy
2. potential energy
3. kinetic energy
4. electricity
5. fossil fuel
6. vibrate
7. circuit
Chapter 2
1. thermal energy
2. heat
3. friction
4. conduction
5. conductor
6. insulator
7. convection
8. radiation
9. thermometer
Chapter 3
1. force
2. motion
3. speed
4. gravity
5. weight
6. work
7. simple machine
8. lever
9. inclined plane
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