Across
- 2. To _____ something means to change it through a series of steps that may be natural or artificial.
- 5. During _____, water changes from a liquid to a gas, and during condensation, the opposite happens.
- 9. _____ is the process by which water vapor changes to a liquid when it comes in contact with a cold surface.
- 10. If something is _____, it contains poisonous or otherwise harmful substances.
- 11. A whale needs to head to the ocean's _____ to take a new breath of air.
Down
- 1. Air is a _____ that expands and contracts to fill all the space it can.
- 2. The _____, or point, of an experiment is to test an idea.
- 3. Deserts do not usually receive much _____, such as rain or snow.
- 4. A _____ does not keep the same shape when moved from place to place.
- 6. If an object is _____, it has a firm, stable form or shape.
- 7. _____ is the planet we live on and has one moon.
- 8. Oxygen in the air is _____, or unable to be seen.