Across
1
Ridge of rock or coral near the surface
4
Half of the Earth
6
Largest ocean on Earth
7
City that is seat of government
8
Piece of land jutting into the sea
9
Raised area of land, smaller than a mountain
11
Cold treeless Arctic plain
Down
2
Dry land with little rainfall
3
Land surrounded by water on three sides
5
Region near the equator
10
Largest river in South America
12
Region surrounding the North Pole