Question

Permafrost is the most distinctive feature of:
A. Taiga
B. Temperate grasslands
C. Tundra
D. Pacific northwest

Answer 1

Hint: Permafrost is a region of the Earth's surface that is always frozen. It is typically composed of ice holding soil, gravel, and sand together. Permafrost frequently stays at or below 0 degrees Celsius for at least two years (32oF).

Complete step by step solution:
Permafrost doesn't usually develop as a single continuous film. Its distribution can be categorised in two ways: continuous and discontinuous.

A continuous sheet of frozen material is what continuous permafrost refers to. Except for the area's big bodies of water, all surfaces are covered in continuous permafrost. Permafrost is present year-round in the region of Russia known as Siberia.

Permafrost that is discontinuous is divided into many regions. In the shadow of a mountain or among dense vegetation, some permafrost remains all year. In other places with discontinuous permafrost, the permafrost thaws over several weeks or months in the summer. Permafrost is seen in patches on the ground near Canada's southernmost Hudson Bay shore.

The initial layer to cover the ground does not always have to be permafrost. It can be anywhere between an inch and several miles below the surface of the Earth. It can be found in non-porous bedrock, but it commonly occurs in ground ice. Ice that is keeping different kinds of soil, sand, and rock in combination forms permafrost.
The permafrost, a permanently frozen subsurface, is one of the tundra's distinguishing features.

Therefore the correct option is C i.e., Tundra

Note:
Both the surface of the land and the ocean floor contain permafrost. It can be found where it rarely gets above freezing. As a result, permafrost can be found frequently in Arctic locations including Greenland, Alaska in the United States, Russia, China, and Eastern Europe.