Across
1
Large natural stream of water
4
Area where water covers the soil
5
Low-lying land surrounded by higher ground
9
Physical features of land
10
Largest ocean on Earth
11
Land surrounded by water on three sides
Down
2
Distance east or west of prime meridian
3
Body of water surrounded by land
6
Mountain that can erupt with lava
7
Line dividing two countries
8
Flat grassland in tropical regions
12
Ridge of rock or coral near the surface
13
One of seven major landmasses