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Short season of growth and reproduction 6.
Energy and nutrients in the form of dead organic material 7. Large population oscillations Extract: The arctic is known for its cold, desert-like conditions. The growing season ranges from 50 to 60 days. Rainfall may vary in different regions of the arctic.
Yearly precipitation, including melting snow, is 15 to 25 cm 6 to 10 inches. Soil is formed slowly. A layer of permanently frozen subsoil called permafrost exists, consisting mostly of gravel and finer material.
When water saturates the upper surface, bogs and ponds may form, providing moisture for plants. There are no deep root systems in the vegetation of the arctic tundra; however, there are still a wide variety of plants that are able to resist the cold climate. There are about 1, kinds of plants in the arctic and sub arctic, and these include: Low shrubs, sedges, reindeer mosses, liverworts, and grasses varieties of flowers crustose and foliose lichen All of the plants are adapted to sweeping winds and disturbances of the soil.
Plants are short and group together to resist the cold temperatures and are protected by the snow during the winter. They can carry out photosynthesis at low temperatures and low light intensities. The growing seasons are short and most plants reproduce by budding and division rather than sexually by flowering.
The fauna in the arctic is also diverse: Animals are adapted to handle long, cold winters and to breed and raise young quickly in the summer. Animals such as mammals and birds also have additional insulation from fat.
Many animals hibernate during the winter because food is not abundant. Another alternative is to migrate south in the winter, like birds do. Reptiles and amphibians are few or absent because of the extremely cold temperatures.
Because of constant immigration and emigration, the population continually oscillates. The map right shows the extent of the Glacial Maximum at about 18, years BP and the areas that remained glaciated after this time.
These latter areas are highlands and would have seen the persistence of glacial environments until about 10, years BP. You should be able to describe the maximum extent of glaciation in the British Isles.
Can you name the areas of Valley glaciation too? B on page of course companion.
Make sure that you are able to describe the distribution of Northern Hemisphere Ice Sheets. Notice that earlier in the Pleistocene, coverage was even more extensive. Can you explain why early humans and wildlife was able to migrate with relative ease from mainland Europe to the British Isles.
The same answer explains the movement of animals and humans into the Americas from Asia. The Ice Age in Britain began about 1, years ago and lasted until about 10, years ago.
During this time temperatures fluctuated and ice advanced and retreated four times.one half page essays kanya bhrun hatya essay in punjabi the lifeboat charlotte rogan essay about myself activation synthesis theory research paper, word power verbs for essays katja wollenweber dissertationUs application essay college essay a little over words callicott conceptual foundations land ethic essay valley of ashes symbolism essay.
AQA geography markscheme - Download as PDF File .pdf), Text File .txt) or read online. Angela's Ashes: A Memoir. How To Win Friends and Influence People. The Sympathizer: A Novel (Pulitzer Prize for Fiction) GVI Field.
Enviado por. Menna. Twenty First Century Science Summer Newsletter. The Long Mynd is a heath and moorland plateau that forms part of the Shropshire Hills in Shropshire, England.
The high ground, which is designated as an Area of Outstanding Natural Beauty, lies between the Stiperstones range to the west and the Stretton Hills and Wenlock Edge to the east.
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Day two of our geography fieldtrip to Dorset. Day two of our geography fieldtrip to Dorset Coastal Management Study - Swanage. We will have to do beach profiles and field sketches at each of the three sites, and we will have to do a groyne profile of 4 groynes at the third location, Shep's Hollow.