Across
1
Ridge of rock or coral near the surface
3
Large natural elevation of earth
5
Raised area of land, smaller than a mountain
6
Land surrounded by water
7
Where river meets the sea
8
Large natural stream of water
Down
2
Cold treeless Arctic plain
4
Half of the Earth
9
Ocean between Americas and Europe/Africa
10
Largest river in South America
11
Distance north or south of equator
12
Region between the two tropic lines