Geography

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Across
  1. 6. Gas essential for respiration (6)
  2. 7. Layer where most meteors burn up (8)
  3. 8. Layer that contains satellites and space stations (9)
  4. 9. Layer closest to the Earth’s surface (11)
Down
  1. 1. Layer that protects Earth from harmful UV rays (10)
  2. 2. Gas that helps trap heat in the atmosphere (6)
  3. 3. Layer where weather occurs (11)
  4. 4. The coldest layer of the atmosphere (9)
  5. 5. Gas that makes up about 78% of the atmosphere (8)