There are two types of tundra: Arctic and Alpine. Arctic tundra receives less than 10 inches of rain per year and experiences winter temperatures as low as -70 degrees Fahrenheit, located in places like Alaska, Scandinavia, and northern North America. Alpine tundra is treeless with dwarf trees and heaths due to rocky, gravelly soil that inhibits root growth, hosting only a few predators and animals that can withstand the cold. Permafrost, or permanently frozen subsoil, can extend over 3,000 feet deep in Arctic tundra.