Landform X-Word Puzzle

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Across
  1. 2. Not as high as a mountain.
  2. 3. A large area of flat land with few trees.
  3. 4. Land completely surrounded by water.
  4. 6. There are 7 of these on Earth.
  5. 7. lowlands between mountains.
Down
  1. 1. tract of sediment deposited at the mouth of a river.
  2. 3. land surrounded on 3 sides with water.
  3. 4. A narrow strip of land that joins two large lands.
  4. 5. the highest landform.