Across
1
Low-lying land surrounded by higher ground
4
Ridge of rock or coral near the surface
6
Land surrounded by water on three sides
7
Mountain that can erupt with lava
10
One of seven major landmasses
11
Wearing away of land by water or wind
12
Goods sold to another country
Down
2
Goods brought in from another country
3
Flat grassland in tropical regions
5
Imaginary line around the middle of Earth
8
Largest ocean on Earth
9
Physical features of land