Across
1
Ridge of rock or coral near the surface
4
Line dividing two countries
7
Largest river in South America
9
Long-term weather patterns of an area
Down
2
Narrow sea inlet between cliffs
3
Wearing away of land by water or wind
5
Landform where river meets the sea
6
Body of water surrounded by land
8
Large natural stream of water
10
Chain or group of islands
11
Mountain that can erupt with lava