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4. reef a ridge of rock in the sea formed by the growth and deposit of coral.
5. small hill of sand formed by the wind in a desert.
7. a very high hill, often with rocks near the top.
8. an area in the desert where there is water and where plants grow.
11. a piece of land that is completely surrounded by water.
12. a place where water comes naturally to the surface from under the ground.

1. an area of land that is almost surrounded by water but is joined to a larger piece of land.
2. a deep Valley with steep sides of colored rock.
3. land outside towns and cities, with fields and farms where farmers live and work.
6. an area of land that is higher than the land around it, but not as high as a mountain.
9. the salt water that covers most of the earth surface and surrounds its continents and islands.
10. a natural flow of water that continues in a long line across land to the see.