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Across
- 2. Vibrations that travel through the air and are heard by ears
- 6. A test done to discover something new
- 8. Related to the large plates that make up Earth's surface
- 9. Carefully watching and noting what happens
Down
- 1. A community of living things and their environment working together
- 3. A substance that living things need for energy and growth
- 4. The amount of space something takes up
- 5. A pattern of energy moving through space or matter
- 7. The tendency of an object to stay still or keep moving