Energy resources (with one unrelated question)

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Across
  1. 2. We can run out of this kind of energy resource.
  2. 7. The process of injecting liquid at high pressure into rocks.
  3. 8. Magma that is deep below underground that may ascend from, or toward the surface.
  4. 10. Oil, coal, and Natural Gas.
  5. 13. Where elements combine to create a heavier element.
  6. 15. We have to control the flow of rivers to get this energy source.
  7. 16. We mine this energy resource.
Down
  1. 1. Mainly used in Iceland.
  2. 3. The kind of energy resources that never run out.
  3. 4. This energy source uses blades that turn a generator, which is how we get electricity from it.
  4. 5. Organic energy resource.
  5. 6. Flammable, colorless, and odorless.
  6. 9. Homer Simpson works at one of the kinds of power plants we use to obtain this energy source.
  7. 11. This energy resource makes sunlight become energy.
  8. 12. What is the name of my dog? Hint: My dog is named after a red gem.
  9. 14. Mainly used as fuel.