Not all deserts are warm, and it is possible to have a cold desert. Some deserts may supply sufficient water for life. Due to the low humidity and water level, there typically are wide daily temperature fluctuations. Rain is brief, heavy, and seldom, and the plants have evolved such that their flowering schedule coincides with available rainfall. Tundra may be divided into arctic and alpine tundras.
Arctic tundra is that in very northerly latitudes, encircling the Northern Hemisphere.
Typical vegetation includes sedges, heaths, willows, etc., and geological features include lakes, bogs, streams, rocky soil, and some high ground. Because there are few trees and those that do grow here are short and stunted, it is very windy. Due to the permafrost, the soil not permeable so water stays near the top of the soil in the little bit that thaws. Thus plants can get enough water despite the wind. Forests include a variety of types.