Nature

1. A piece of land surrounded by water.
6. A large body of water surrounded by land.
9. A large, flowing body of water that usually empties into a sea or ocean.
10. A dense forest rich in biodiversity, found typically in tropical areas with consistently heavy rainfall.
13. A pebbly or sandy shore, especially by the sea between high- and low-water marks.
14. A large open area of grassland, especially in the Mississippi River valley.
15. A mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.

2. A barren area of landscape where little precipitation occurs and living conditions are hostile for plant and animal life.
3. A cascade of water falling from a height, often forming a pool below.
4. A very high hill, often with rocks and snow at the top.
5. A large underground chamber, typically of natural origin, in a hillside or cliff.
7. A slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles.
8. A low area of land between hills or mountains, typically with a river or stream flowing through it.
11. A vast body of salt water that covers more than two-thirds of the earth's surface.
12. A large area covered with trees and undergrowth.