Unit 3: Weather

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Across
  1. 3. How much water vapor (water in the air) is in the atmosphere.
  2. 5. The weight of the air pressing down on Earth’s surface
  3. 8. Columns of air moving downward, often in storms.
  4. 9. Tiny particles (like dust or salt) in the air that water droplets can stick to in order to form clouds
  5. 11. A single piece of hail
  6. 13. The amount of matter in an object.
  7. 15. How tightly packed the matter in an object is.
  8. 17. An upward force that pushes air or objects upward (important in storms and flying)
  9. 18. When clouds become too heavy to hold all the water vapor, the water vapor turns back into water and falls from the clouds, assisted by gravity.
Down
  1. 1. The force that pulls objects toward Earth
  2. 2. When a gas changes back into a liquid, usually when it cools down.
  3. 4. Columns of air moving upward, especially inside thunderstorms.
  4. 6. The percentage of water vapor in the air compared to how much it could hold at that temperature.
  5. 7. The transfer of heat through a solid material when particles bump into each other
  6. 10. The measure of average kinetic energy of a particle of a substance.
  7. 12. When a liquid changes into a gas, usually because it’s heated
  8. 14. A device that measures air pressure
  9. 16. chunks of ice that fall from thunderstorms