Solve these clues to fill the grid.
- Low land that is seasonally flooded
- 1 Across
- A vast treeless plain in the Arctic regions where the subsoil is permanently frozen
- 5 Across
- A fertile tract in a desert
- 6 Across
- The largest inland sea
- 8 Across
- A land mass that is surrounded by water
- 11 Across
- A sudden shaking of the ground caused by movement within the Earth.
- 13 Across
- A ravine formed by a river in an area with little rainfall
- 14 Across
- Dry land with very little rain
- 15 Across
- A narrow channel of the sea joining two larger bodies of water
- 1 Down
- A relatively flat highland
- 2 Down
- Extensive plain without trees
- 3 Down
- A land mass that projects well above its surroundings
- 4 Down
- A measuring instrument for detecting and measuring the intensity and direction and duration
- 7 Down
- A ___ with heavy annual ___
- 9 Down
- A mountainous region of northern Scotland famous for its rugged beauty
- 10 Down
- A crack in the earth's crust resulting from the displacement of one side with respect to the other
- 12 Down