Across
- 1. rain, snow, sleet, or hail that falls to the ground
- 3. smooth, non-intersecting lines on a map that represent air pressure over a large region
- 5. to predict future events or conditions, such as weather
- 6. an estimation about a future event based on data or experience
- 8. air in motion
- 9. the measurable pull or force between Earth and the matter in an object or substance
- 13. to push particles closer together
- 14. the mixture of gases surrounding Earth
- 15. the condition of the air around us
- 16. a continuous force applied to the surface of an object, measured in units per square area
- 18. water vapor in the air
- 19. the scientific study of weather
- 20. anything that has mass and takes up space
- 21. to get bigger; to take up more space
Down
- 2. an atom or a molecule; what everything is made of
- 4. the force exerted on a surface by the mass of the air above it; also called atmospheric pressure
- 7. a wind that blows from land to sea
- 10. a measure of how hot or cold the air is
- 11. the amount of matter in an object or sample
- 12. a scientist who studies the weather
- 17. the layer of gases surrounding Earth. Its layers include the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.