Across
1
Flat grassland in tropical regions
5
Raised area of land, smaller than a mountain
6
Large slow-moving mass of ice
7
Half of the Earth
8
Long-term weather patterns of an area
9
Distance east or west of prime meridian
12
Wearing away of land by water or wind
Down
2
Chain or group of islands
3
Land surrounded by water
4
Largest ocean on Earth
10
Line dividing two countries
11
Where river meets the sea