Across
1
Imaginary line around the middle of Earth
5
Body of water surrounded by land
7
Cold treeless Arctic plain
8
Distance east or west of prime meridian
10
Vast body of salt water
Down
2
Deep narrow valley with steep sides
3
Chain or group of islands
4
Ridge of rock or coral near the surface
6
Line dividing two countries
9
Flat grassland in tropical regions