Across
1
Distance north or south of equator
5
Low-lying land surrounded by higher ground
6
Flat grassland in tropical regions
7
Wearing away of land by water or wind
9
Mountain that can erupt with lava
10
Height above sea level
11
Goods sold to another country
12
Seasonal heavy rainfall
Down
2
Ridge of rock or coral near the surface
3
Large slow-moving mass of ice
4
Chain or group of islands
8
Raised area of land, smaller than a mountain
13
Region near the equator