Upstream 3a

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Across
  1. 1. – A long period without rain.
  2. 4. – Water stored beneath Earth's surface.
  3. 6. – The reduction or exhaustion of a resource.
  4. 7. – The height of the ocean’s surface.
  5. 8. – The increase in Earth's temperature due to greenhouse gases.
Down
  1. 2. – The increase in volume of substances as they get warmer.
  2. 3. – Catching too many fish, leading to a decline in fish populations.
  3. 5. – Not suitable for living.