[DOC] [TLE] Tundra - Wikipedia [PAR] In physical geography, tundra is a type of biome where the tree growth is 
hindered by low temperatures and short growing seasons. The term tundra 
comes through Russian  (tndra) from the Kildin ... The soil there is frozen 
from 2590 cm (1035 in) down, and it is impossible for trees to grow. Instead, 
bare and... [DOC] [TLE] Permafrost - Wikipedia [PAR] Used in: International Permafrost Association. Climate: High latitudes, alpine 
regions. Wikinews has related news: Scientists warn thawing Siberia may trigger 
global meltdown. Slope failure of permafrost soil, revealing ice lenses. In geology
, permafrost is ground, including rock or (cryotic) soil, at or below the freezing 
point of ... In areas not overlain by ice, it exists beneath a layer of soil, rock or 
sediment,... [DOC] [TLE] Plants and Frozen Ground | National Snow and Ice Data Center [PAR] The deep layer of soil under the layer of frozen ground can support them. When 
snow ... The active layer of tundra is too thin for trees to grow, because it cannot 
support a tree's roots. Tundra is ... Usually, people think of deserts as hot and dry. [DOC] [TLE] Teacher's Guide - Tundra Soils | Soils 4 Teachers [PAR] Most of these soils have permafrost, which is soil that is frozen year round. ... 
Although usually thought of as treeless, some low-growing trees (e.g. birch or ... 
Tundra soils form in cold environments with short growing seasons and harsh 
winters. ... Even though the soil is permanently frozen, the surface layer or active 
zone... [DOC] [TLE] Science Lesson 21 Climate Regions Flashcards | Quizlet [PAR] *Tundra has a layer of soil that is always frozen, known as permafrost. .... Trees 
do not grow in the tundra climate regions, which has short, cool summers, bitterly
... [DOC] [TLE] Biomes - Introduction and the Tundra [PAR] Arctic tundra represents one of the newest communities or ecosystems in the 
world, because it ... A distinctive feature is a layer of permafrost, or permanently 
frozen soil, or as arctic ecologists call it "perennially frozen ground", usually about 
1-2 ... The term was coined by S.W. Muller in 1943, who wrote (quoted in Bolen, 
pg. [DOC] [TLE] Tundra - definition of tundra by The Free Dictionary [PAR] A cold, treeless, usually lowland area of far northern regions. The subsoil of 
tundras is permanently frozen, but in summer the top layer of soil thaws and can... [DOC] [TLE] Permafrost | Weather Underground [PAR] Permafrost is permanently frozen soil, and occurs mostly in high latitudes. ... The 
active layer is ground that is seasonally frozen, typically lying above the 
perennially frozen .... Tundra is usually characterized by sedges and grasses. ... 
or of short-term duration, with the exception of Russia's long-term permafrost 
monitoring. [DOC] [TLE] The Tundra Biome Tundra is the coldest of all the biomes ... - StepMap [PAR] Land: The Tundra is permanently covered by a layer of frozen soil, ... 
Precipitation: The average yearly precipitation in the Tundra is usually less than 
...... While some sources claim that the word 'tundra' originates from the Kildin 
Sami term 'tundar', .... or shelter), reducing the number of organisms that can 
survive in a given... [DOC] [TLE] taiga - National Geographic Society [PAR] Jun 9, 2011 ... The soil beneath the taiga often contains permafrosta layer of permanently 
frozen soil. In other ... Birds native to the taiga usually migrate south during the 
freezing winter months. ... Term, Part of Speech, Definition, Encyclopedic Entry ... 
all weather conditions for a given location over a period of time. [DOC] [TLE] Boreal Forests and Arctic Tundra - Boundless [PAR] The soil in boreal forest regions is usually acidic and contains little available 
nitrogen. Boreal forests have lower productivity than tropical or temperate forests; 
they also have less diversity, with only a tree layer and ground layer. ... The soils 
of the Arctic tundra may remain in a perennially frozen state ... Key Term 
Reference

Question: Term given to the tundra's always-frozen soil layer
Answer: permafrost