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Across 2. The transfer of thermal energy from one material to another by direct contact. 10. The transfer of thermal energy by the circulation or movement of a liquid or a gas, this is the most common way thermal energy moves. 11. The second layer of the atmosphere, this layer gets warmer as you go higher up. 15. The height of an object above Earth's surface. 16. A layer of gases that surrounds a material body or planet. 17. A natural light display in the sky caused by the collision of energetic charged particles with atoms in the high altitude atmosphere 18. Part of the mesosphere, thermosphere, and exosphere where charged particles are ionized by solar radiation.

Down 1. This often rises and falls throughout the different layers of the atmosphere. 3. Found in sunlight and much of it is blocked by the Earth's Ozone Layer. 4. The biggest of all the layers of the atmosphere, auroras happen here and temperatures can reach 1,500 degrees Celsius. 5. Mainly located in the lower stratosphere and helps protect us from ultraviolet radiation. 6. The measure of the force with which air molecules push on a surface. 7. The second most common element of Earth's atmosphere, making up about 21% of it. 8. The layer directly above the stratosphere, meteors tend to get broken apart in this layer. 9. The uppermost layer of the atmosphere, molecules traveling fast enough can escape into space from this layer. 12. The first layer of the atmosphere, weather occurs here. 13. This element makes up around 78% of Earth's atmosphere. 14. A molecule made up of three oxygen atoms.