Across
1
Half of the Earth
4
Large body of water partly enclosed by land
5
Mountain that can erupt with lava
9
Distance east or west of prime meridian
11
Low-lying land surrounded by higher ground
13
Deep narrow valley with steep sides
Down
2
Area where water covers the soil
3
Flat grassland in tropical regions
6
Imaginary line around the middle of Earth
7
Large natural elevation of earth
8
Ridge of rock or coral near the surface
10
Total number of people in an area
12
Flat elevated area of land