Across
1
Cold treeless Arctic plain
3
Raised area of land, smaller than a mountain
6
Long-term weather patterns of an area
7
Imaginary line around the middle of Earth
9
Wearing away of land by water or wind
Down
2
Distance east or west of prime meridian
4
Height above sea level
5
Vast body of salt water
8
Large slow-moving mass of ice
10
Flat elevated area of land