Earth

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Across
  1. 2. Substance containing carbonate ions.
  2. 4. The layers of gases that surround the Earth. The important gases in the atmosphere are nitrogen, oxygen and carbon dioxide.
  3. 5. The gain of oxygen, or loss of electrons, by a substance during a chemical reaction.
  4. 7. A substance formed by the chemical union of two or more elements.
  5. 8. When a substance breaks up and mixes completely with a solvent to produce a solution.
  6. 9. gas A naturally occurring hydrocarbon gas mixture.
  7. 10. Information or material that shows something is true.
Down
  1. 1. Turned from a gas or vapour into a liquid, usually as a result of cooling.
  2. 3. fuel Natural, finite fuel formed from the remains of living organisms, eg oil, coal and natural gas.
  3. 6. Living entity, eg animals, plants or microorganisms.
  4. 7. oil Mixture of hydrocarbons, mainly alkanes, formed over millions of years from the remains of ancient dead marine organisms.