Atmosphere

Edit Answers
12345678910111213
Across
  1. 2. the gas that makes up 1/5 of Earth's atmosphere
  2. 4. the fourth layer of atmosphere above Earth
  3. 5. the gas that makes of 3/4 of Earth's atmosphere
  4. 8. where the pressure or weight of air is the strongest
  5. 10. the weight of air
  6. 11. the layer so far from Earth that Earth's gravity can no longer keep the gas near Earth and gas particles drift away
  7. 12. the layer of the atmosphere that is 50 miles above the Earth's surface
Down
  1. 1. the layer of atmosphere closest to Earth
  2. 3. the layer of the atmosphere that is 30 miles above Earth's surface
  3. 6. a layer in the atmosphere that protects us from the sun's radiation
  4. 7. the layer of gas that surrounds the Earth. It can be found on other planets and some large moons, but not all planets.
  5. 9. what holds the gases close to Earth
  6. 13. a gas found in the higher layers of the Earth's atmosphere. Used in balloons to make them float.