Use the clues to complete the crossword.
Across
3 an area of land with lots of tropical plants and trees
4 a forest with tall trees, warm climate and lots of rain
6 very big sea
8 where a river falls over a cliff
9 hot and dry area with no plants

Down
1 very high hill
2 a hill with a hole at the top that sometimes has fire coming from it
5 an area of grass where farmers can grow things
7 this is where the land meets the sea