Natural features

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Across
  1. 3. thick mass of ice and snow
  2. 4. geographical accident caused by a river
  3. 5. Flat terrain with a lower level tha
  4. 7. A Dangerous mountain
Down
  1. 1. Taller and larger than a hill
  2. 2. A mass of salt water
  3. 3. The city or town that serves as the seat of government for a country or state.
  4. 6. Sea inlet on land