LANDFORMS DUE TO WATER ACTION IN THE DESERTS
Wind erosion, transportation and deposition are most effective and widespread in desert regions, but few deserts in the world are entirely without rain or water. In some deserts, there are perennial rivers such as the Nile in Egypt which has…
LANDFORMS OF WIND DEPOSITION IN DESERTS
Materials that have been eroded and transported by winds must come to rest somewhere. The finest dust travels enormous distances in the air, and may be moved completely out of the desert. It has been estimated that some dust grains…
FEEDING HABITS
Organisms exhibit different feeding habits. These are: Filter Feeding Filter feeders which are also called microphagous feeders feed on very tiny organisms which cannot be easily picked to the satisfaction of the feeder. Filter feeders are mainly aquatic animals and…
EXCRETION IN MAMMALS
There are four types of excretory organs used by mammals. These are: lungs, skin, liver and kidneys. The lungs excrete water vapour and carbon dioxide, the liver excretes bile pigments called bilirubin (derived from the decomposition of haemoglobin), the skin…
LANDFORMS OF WIND EROSION IN DESERTS
In the combined processes of abrasion, deflation and attrition, a wealth of characteristic desert landforms emerge. 1) Rock pedestals or mushroom rocks: The sand-blasting effect of winds against any projecting rock masses wear back the softer layer so that an…
THE MECHANISM OF ARID EROSION
Arid landforms are as a result of many combined factors, one reacting upon the other. Insufficient rainfall, often less than 127 mm (5 inches), coming at most irregular periods, coupled with very high temperatures (31°C/87°F, is the average) and a…
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