Search results
Results From The WOW.Com Content Network
The Bounty Islands are small granite rocks (with a maximum height of 88 m or 289 ft), while the small Antipodes Islands group (maximum height 366 m), the largest group the Auckland Islands (705 m or 2,313 ft) and Campbell Island (569 m or 1,867 ft) are volcanic in origin. Macquarie Island (433 m or 1,421 ft) is the furthest south and the coldest.
In physical geography, tundra (/ ˈ t ʌ n d r ə, ˈ t ʊ n-/) is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. There are three regions and associated types of tundra: Arctic, [2] Alpine, [2] and Antarctic. [3] Tundra vegetation is composed of dwarf shrubs, sedges, grasses, mosses, and lichens ...
The tundra is an extremely harsh, cold, windy, and unique ecosystem found on the extreme north and south latitudes of our Earth. The soil consists mostly of frozen permafrost, which makes it difficult for extended root systems to grow, and water to drain and support a wide variety of plant life.
Southern Indian Ocean Islands tundra: Crozet Islands, Prince Edward Islands, Heard Island, Kerguelen Islands, McDonald Islands: Transantarctic Mountains tundra: Transantarctic Mountains: Australasian realm; Antipodes Subantarctic Islands tundra: Australia, New Zealand: Nearctic realm; Alaska–St. Elias Range tundra: Canada, United States ...
Ice features such as ice wedges and pingo mounds of soil and ice can be found. This coast has an arctic climate warm enough to allow plant growth in late-June, July and August only, and even then frosts may occur. On the whole this is a damper, wetter area than the Low Arctic tundra ecoregion that continues along the coast west of here to ...
Much of the ecoregion at lies beneath glaciers and icefields and is largely devoid of vegetation. Where the ground is vegetated, communities are dominated by dwarf and low shrub communities, including mountain heath and ericaceous shrubs. Subalpine forests of alpine fir, mountain hemlock, and Sitka spruce dominate middle elevations.
These rocky islands support a variety of plant life, such as tussock grasses, that has adapted to the snowy and icy conditions.There are a number of endemic plant species including Poa cookii grass and the Kerguelen cabbage (Pringlea antiscorbutica), historically a source of vitamin C for sailors, is found on all the islands, not only the Kerguelens.
Arctic vegetation is largely controlled by the mean temperature in July, the warmest month. Arctic vegetation occurs in the tundra climate, where trees cannot grow.Tundra climate has two boundaries: the snow line, where permanent year-round snow and ice are on the ground, and the tree line, where the climate becomes warm enough for trees to grow. [7]