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Across
- 2. The distance between one wave peak and the next
- 3. The remains of a plant or animal from long ago preserved in rock
- 5. A form of energy used to power lights and machines
- 7. A hard solid piece of the Earth made of minerals
- 8. The natural home of an animal or plant
- 9. The power that makes things move or change
Down
- 1. To find the size, amount, or degree of something
- 4. Two or more substances mixed together but not chemically joined
- 6. The wearing away of land by water, wind, or ice