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pressure. Trade winds move the air back to be reheated at the equator and the cycle continues. This is known as the Hadley cells which appear at both 30N 23.5 N and 30S. 23.5 S. There are also cells at the poles called Polar cells and these poles are here due to the very cold air in these areas becoming very dense and falling to create more zones of high pressure. Due to earth rotation, some of the air from the high pressure zone at the poles falls to lower latitudes. In these lower latitudes the air is heated and rises back towards the poles where it is cooled again, creating a zone of low pressure. The ferrel cell arises from the differences in temperature between the polar cell and the hadley cell. The Hadley and Polar cells both power this middle cell. Warm air from the hadley cell at the tropics feeds into higher altitudes whilst cooler air from the polar cell feeds into lower latitudes. 2)Describe the origin, nature and we]]> Mon, 12 May 2008 19:31:19 +0000 mod http://higherex.pbwiki.com/Rural email.hidden@example.com (meki) meki edited Rural (ii)Extensice Commercial Farming (4)
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Extensive commercial agriculture
Extensive commercial agriculture is found in warm, dry areas on the east coast of Britain and the great plains of America. In summer the weather is extremely warm and dry and in winter it is very cold which is good for the soil. The landscape of this type of farming consists of extremely large rectangular fields allowing for machinery to be used easily. Monoculture is common and huge amounts of cereals are produced. The poplulation density is very low with few workers as machinery is used a lot. Fertilisers and pesticides are also common. There are few hedgerows and any lakes will be filled in to make maximum space for crop growing. There are very few settlements and the few that exist are found around road junctions or along roads.
]]> Wed, 07 May 2008 14:34:56 +0000 mod http://higherex.pbwiki.com/Rural+Land+Resources email.hidden@example.com (Daniel Borland) Daniel Borland edited Rural Land Resources Ribbon Lake: A ribbon lake is a lake formed in a u-shaped valley. As the ice melts it may leave behind water in a hollow which was created as the glacier abrased and plucked the valley floor faster in some areas, this may have been due to rock type.
Hanging Valley:Hanging valleys are created by small tributary glaciers just off of the main glacier. They are much smaller and have much less power. They travel down the valley side until they reach the main valley where the main glacier is eroding. Since it is not powerful enough to erode past this glacier, it remains here and leaves a much smaller valley hanging off the edge of the previous valley. Water from the glacier melts and travels down the valley, when it gets to the edge it falls off and creates a waterfall. Waterfalls are a key identifier of hanging valleys. Alluvium from the river can be depoisted at the bottom of the waterfall, this is called an aluvium fan.
given AnswerFor Answer
The popularity of national parks is determin]]> Wed, 07 May 2008 14:29:48 +0000 mod http://higherex.pbwiki.com/Lithosphere email.hidden@example.com (Lynne Burns) Lynne Burns edited Lithosphere Select one feature of erosion and one feature of of deposition, and explain the processes involved in the formation of each feature. (6 marks)
Erosional Features eg Hanging Valley Corrie Roche Moutonee Answer: Corries are formed when snow collects on a mountainside hollow (usually north facing) during glaciation. This snow compacts into ice forming a glacier. As the weight of the glacier pulls it down the mountain out of the hollow erosion occurs as plucking, which is the process where ice freezes onto rocks and then as the ice moves it pulls the rocks away with it, steepens the back wall and abrasion, which is where rocks which are stuck in the bottom of the glacier scrape away at the surrounding rock, deepening the floor.This causes the hollow to become deep and have a very steep back wall. In addition, frost shattering also occurs at the steep back side of the corrie. The crrie moves down the mountain in a circular motion known a]]> Wed, 07 May 2008 14:26:50 +0000 mod http://higherex.pbwiki.com/Biosphere email.hidden@example.com (:)) :) edited Biosphere Plant succession describes the changes in vegetation that develop through time in a particular habitat.
describe and explain the lant succession for either a derelict urban or a sand dune habitat. youy should make reference to specific plants. 12 marks
windy, due dry,due to the free draining nature of sand, dry, salty, and has little humus (provided by stranded sea weed).
the first part you have
The Embryo dunes is the embryo dunes. Pioneer where pioneer plants thrive here. thrive. For example saltwort, which has have waxy leaves which do not have much transpiration so store water well, to help to retain moisture, and have long deep tap roots to get water from the deep water table adnd 'hug' table. The fore dunes follow in the ground succession and have scattered plants found also on the embryo dunes. Couch gras]]> Wed, 07 May 2008 14:25:41 +0000 mod http://higherex.pbwiki.com/FrontPage email.hidden@example.com (Daniel Borland) Daniel Borland edited FrontPage]]> Wed, 07 May 2008 14:08:41 +0000 mod http://higherex.pbwiki.com/Biosphere email.hidden@example.com (f) f added Biosphere Plant succession describes the changes in vegetation that develop through time in a particular habitat.
describe and explain the lant succession for either a derelict urban or a sand dune habitat. youy should make reference to specific plants. 12 marks

The condtions at the foreshore are very exposed. It is very windy, due to the free draining nature of sand, dry, salty, and has little humus (provided by stranded sea weed).
the first part you have is the embryo dunes. Pioneer plants thrive here. For example saltwort, which has waxy leaves which do not have much transpiration so store water well, have long deep tap roots to get water from the deep water table adnd \'hug\' the ground to provide cover from the wind.
]]> Wed, 07 May 2008 13:52:43 +0000 add http://higherex.pbwiki.com/new+page email.hidden@example.com (...) ... added new page Erosional Feature - Corrie
A corrie is formed when snow begins to gather in the hollow of a north facing mountain. This snow continues to fall and eventually, the snow which is underneath it is compressed into ice.This ice grows, and through the processes of plucking and abraision it deepens the hollow. Plucking is when the ice of the glacier which has been formed, attaches itself to the backwall and when it moves it pulls off some of the rock behind it. The rock which falls from plucking goes under the glacier and the glacier moves it to erode away the ground beneath it. When the glacier begins to move down the mountain side it deposits the rock which is underneath it and leaves a rock lip.
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