The Earth 2 Key Words

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Across
  1. 5. The only organisms responsible for removing carbon from the environment.
  2. 6. A really useful metal that is extracted by displacement.
  3. 7. The layer of gases surrounding the Earth.
  4. 9. Around 80% of the atmosphere is made from this gas.
  5. 10. A chemical reaction that all living things do that takes in oxygen and releases carbon dioxide.
Down
  1. 1. A chemical reaction that plants do that takes in carbon dioxide and releases oxygen.
  2. 2. Around 20% of the atmosphere is made from this gas.
  3. 3. A type of chemical reaction where a more reactive element replaces a less reactive element.
  4. 4. The ______ cycle shows how this element moves around the environment.
  5. 8. A type of material that is shiny, durable, malleable and conducts electricity.