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Across
- 2. The invisible force that pulls things toward the Earth
- 4. A unit of information that passes traits from parents to children
- 6. Something in an experiment that can be changed or measured
- 7. The part of an experiment that stays the same for comparison
- 8. How tightly packed the matter is in something
Down
- 1. A sample of something used for study
- 2. The process of getting bigger or more developed
- 3. A mountain with an opening that can erupt hot lava
- 5. When a solid mixes into a liquid and seems to disappear