Unit 2

2. a line of large stones sticking up from the sea
3. a large hole in the side of a hill, cliff, or mountain, or one that is underground
5. a raised part of the earth's surface, much larger than a hill, the top of which might be covered in snow:
6. an area of low land between hills or mountains, often with a river running through it
7. a very large area of sea
9. an area of land that is higher than the surrounding land:
10. a large area of land covered with trees and plants, usually larger than a wood, or the trees and plants themselves:
13. water that flows naturally along a fixed route formed by a channel cut into rock or ground, usually at ground level
15. a large area of water surrounded by land and not connected to the ocean except by rivers or streams:

1. a mountain with a large, circular hole at the top through which lava (= hot liquid rock) gases, steam, and dust are or have been forced out
4. water, especially from a river or stream, dropping from a higher to a lower point, sometimes from a great height
8. a high area of rock with a very steep side, often on a coast:
11. the land along the edge of a sea, lake, or wide river
12. an area, often covered with sand or rocks, where there is very little rain and not many plants:
14. a natural wide flow of fresh water across the land into the sea, a lake, or another river: