Solve these clues to fill the grid.
- A series of hills or mountains
- 4 Across
- Flat tableland with steep edges
- 7 Across
- A slide of large masses of snow and ice and mud down a mountain
- 8 Across
- Rock that in its molten form issues from volcanos
- 9 Across
- Condition in which the earth's surface is worn away by the action of water and wind
- 10 Across
- A relatively flat highland
- 11 Across
- The weather in some location averaged over some long period of time
- 12 Across
- A land mass that projects well above its surroundings
- 1 Down
- Usually paved outdoor area adjoining a residence
- 2 Down
- A relatively low hill on the lower slope of a mountain (plural)
- 3 Down
- The type of environment in which an organism or group normally lives or occurs
- 5 Down
- A long depression in the surface of the land that usually contains a river
- 6 Down