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3. – Meteors burn up in this part of the atmosphe r vapor – This gaseous form of water contributes to cloud formation.
6. – The ozone layer is found in this atmospheric layer.
8. – This layer of the atmosphere contains nearly all weather phenomena.
10. – Irregular air movement that causes rough flying conditions.
11. – As a plane climbs in ______, the air pressure decreases.
12. – [A picture of a funnel-shaped storm touching the ground.]
14. dioxide – Plants use this gas for photosynthesis.
17. – [An image of a fluffy white cumulus cloud in the sky.]
19. – The most abundant gas in Earth's atmosphere.
20. – The Sahara Desert has a hot and dry ______.

1. – [A chemical symbol "O₂" or a picture of an oxygen tank.]
2. – The International Space Station orbits in this atmospheric layer.
4. – [A diagram showing the Earth's atmospheric layers with the exosphere at the top.]
5. – Today's ______ forecast predicts heavy rain and strong winds.
7. – The study of the atmosphere and weather patterns.
9. – The force that pulls objects toward the center of the Earth.
13. pressure – The weight of the air pressing down on Earth.
15. –The layer of gases surrounding a planet, essential for weather and life on Earth
16. – [A satellite image of a swirling storm over the ocean.]
18. – A region of Earth's atmosphere filled with charged particles.