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Across
- 2. The amount of matter in an object
- 6. The breaking down of rocks by weather, water, and living things
- 7. A form of energy that makes things warm
- 8. A gas in the air that living things need to breathe
Down
- 1. The molecule inside cells that carries instructions for life
- 3. Small pieces of rock and soil carried by water and wind
- 4. The passing of traits from parents to their children
- 5. A tiny particle of light energy