Across
1
Imaginary line around the middle of Earth
4
Flat grassland in tropical regions
5
Low-lying land surrounded by higher ground
7
Large natural stream of water
9
Area where water covers the soil
Down
2
Ocean between Americas and Europe/Africa
3
Mountain that can erupt with lava
6
Low area between mountains
8
Large slow-moving mass of ice
10
Line dividing two countries