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Across 3. Where does all of the energy in the Earth come from 7. Closest layer to Earth 8. The only substance in our atmosphere that can exist as a solid, liquid or gas 9. Upper limit of the Troposphere 10. What are clouds made of 11. Furtherest layer from Earth 12. Upper limit of the Mesosphere

Down 1. Produced when electric plants release sulfur gases 2. Second closest layer to Earth 4. Upper limit of the Stratosphere 5. How many Layers are there 6. Layer located above the Stratosphere