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Across
- 1. How often something happens in a given time
- 4. All the chemical processes in your body that keep you alive
- 5. A substance made of two or more elements bonded together
- 7. A curved piece of glass that bends light
- 8. A hard solid piece of the Earth made of minerals
- 9. To study something carefully to understand it
Down
- 2. The wearing away of land by water, wind, or ice
- 3. Facts and information collected from experiments
- 6. A natural solid substance found in the earth