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  1. 1. a chemical element that forms diamonds and coal and that is found in petroleum and in all living plants and animals
  2. 5. of, relating to, or using the natural heat produced inside the Earth
  3. 7. a material (such as coal, oil, or gas) that is burned to produce heat or power
  4. 10. the conditions that surround someone or something
  5. 11. no longer existing
  6. 12. the whole mass of air that surrounds the Earth
  7. 14. the general weather conditions usually found in a particular place
  8. 18. a person who works to protect the natural world from pollution and other threats
  9. 20. the state or situation that results when something (such as a plant or animal species) has died out completely
  10. 21. the act or result of cutting down or burning all the trees in an area
  11. 22. a layer of rock or sand that can absorb and hold water
  12. 24. something that makes a place or a substance (such as water, air, or food) no longer suitable for use
  13. 25. a science that deals with the relationships between groups of living things and their environments
  14. 26. to make (something) dangerous, dirty, or impure by adding something harmful or undesirable to it
  15. 27. the existence of many different kinds of plants and animals in an environment
  1. 1. a substance that can cause cancer
  2. 2. a black or brownish-black hard substance within the earth that is used as a fuel
  3. 3. capable of being slowly destroyed and broken down into very small parts by natural processes, bacteria, etc.
  4. 4. the gradual destruction of something by natural forces (such as water, wind, or ice)
  5. 6. used to describe a type of animal or plant that has become very rare and that could die out completely
  6. 8. the physical or mental strength that allows you to do things
  7. 9. a black or brownish-black hard substance within the earth that is used as a fuel
  8. 13. the act of producing or sending out something (such as energy or gas) from a source
  9. 15. someone who works to protect animals, plants, and natural resources or to prevent the loss or waste of natural resources
  10. 16. conservation
  11. 17. the quality or state of having many different forms, types, ideas, etc.
  12. 19. everything that exists in a particular environment
  13. 21. made to be used once or only a few times : made to be thrown away after one use or several uses
  14. 23. something (such as a leaf, skeleton, or footprint) that is from a plant or animal which lived in ancient times and that you can see in some rocks