Across
1
Half of the Earth
5
Mountain that can erupt with lava
7
Vast body of salt water
8
Wearing away of land by water or wind
10
Where river meets the sea
12
Largest ocean on Earth
13
Region near the equator
Down
2
Line dividing two countries
3
Dry land with little rainfall
4
Region surrounding the North Pole
6
Distance east or west of prime meridian
9
Deep narrow valley with steep sides
11
One of seven major landmasses