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Across 2. A mixture of gases that surrounds a planet, such as Earth. 8. The uppermost layer of the atmosphere, in which temperature increases as altitude increases. 9. The outermost layer of Earth, varying in thickness from more than 60 km to less than 5 km. 10. The layer of the atmosphere above the stratosphere. The coldest layer of the atmosphere. 11. The layer of the atmosphere between the stratosphere and the thermosphere and in which temperature decreases as altitude increases.

Down 1. The layer of the atmosphere that is above the troposphere and in which temperature increases as altitude increases. 3. The layer of the Earth's atmosphere closest to the ground; contains clouds, smog, weather, and 75 percent of atmospheric gases. 4. The liquid layer of Earth's core that surrounds the solid inner core and is comprised of iron and nickel 5. The continuous movement of water from the ocean to the atmosphere to the land and back to the ocean. 6. The dense, solid center of Earth, formed mostly of iron and nickel. 7. The layer of the Earth between the crust and the core.