natural accidents

4. a low area of land between hills of mountains, typically with a river or stream flowing through it
8. a luxuriant, dense forest rich in biodiversity, found typically in tropical areas with consistenly heavy rainfall
9. is a place where water flows over the edge of a steep, high cliff in hills or mountains, and falls into a pool below
10. a strip of land covered with sand, shingle, or small stones at the edge of a body of water, especially by the sea between high and low water marks
12. an area of open land, especially one planted with crops or pasture, typically bounded by hedges or fences

1. a large natural stream of water flowing in a channel to the sea, alake, or another river
2. a very large expanse of sea, in particular each of the main areas into which the sea is divided geographically
3. a piece of land surrounded by water
5. a large area of water surrounded by land
6. a small river that flows on or below the surface of the ground
7. a large natural elevation of the earth´s surface rising abruptly from the surrounding level; a large steep hill
11. arid land with generally sparse vegetation