Aquatic Ecosystems

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Across
  1. 3. Freshwater ecosystems with fast-moving water like rivers.
  2. 6. The other primary ecosystem type besides aquatic.
  3. 8. Rich variety of life supported by aquatic ecosystems.
  4. 10. Freshwater ecosystems where soil is saturated for long periods.
  5. 12. Small organisms that form the base of the freshwater food web.
Down
  1. 1. Type of discharge that releases toxic chemicals into water.
  2. 2. Major threat to aquatic ecosystems from sewage and waste.
  3. 4. The Earth's system that includes all forms of water.
  4. 5. Transitional areas where rivers meet the sea.
  5. 7. Ecosystem type that covers 71% of the Earth's surface.
  6. 9. High in marine systems but absent in freshwater.
  7. 11. Freshwater ecosystems with still or slow-moving water like ponds.