The tundra is a cold biome where most of the soil is frozen. The soil that is always frozen in the tundra is known as permafrost. Most of the ground in the tundra remains frozen year round causing rainfall to pool and form shallow ponds in summer months. Tall trees are unable to grow in the tundra because of the frozen ground and most other plant growth happens during the short summer.
During the summer north of the Arctic Circle, the sun is in the sky 24 hours a day with no darkness. Animals in the tundra grow thick fur to stay warm. Examples of animals living in the tundra are species like caribou (also known as reindeer), foxes, and wolves.