Natural features

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Across
  1. 2. Water systems protruding from mountains above the earth's surface
  2. 4. Large expanse of sea that is far from land on all sides, and in which no islands are found
  3. 6. Extreme area of a continent or an island that borders the sea or other aquatic body
Down
  1. 1. is an extremely large mass of ice which moves very slowly, often down a mountain valley
  2. 3. is a low stretch of land between hills, especially one that has a river flowing through it
  3. 5. is a small area of water that is smaller than a lake
  4. 7. is the salty water that covers about three-quarters of the Earth's surface