Across
1
Where river meets the sea
4
Cold treeless Arctic plain
6
Land surrounded by water on three sides
7
Raised area of land, smaller than a mountain
8
Chain or group of islands
Down
1
Goods sold to another country
2
Low area between mountains
3
Imaginary line around the middle of Earth
5
Mountain that can erupt with lava
9
Height above sea level
10
Distance east or west of prime meridian
11
Flat elevated area of land
12
Narrow sea inlet between cliffs