landforms of earth

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Information about landforms of earth

Published on March 2, 2014

Author: manojmanike



all about landforms


MORE ABOUT MOUNTAIN? •A mountain is generally steeper than a hill The adjective montane is used to describe mountainous areas and things associated with them. The study of mountains is called Orography. •Exogeology deals with planetary mountains, which in that branch of science are usually called montes (singular—mons). •The highest mountain on Earth based from sea level is Mount Everest (8,848 m (29,029 ft)) in the Himalayas of Asia.

HOW DO MOUNTAIN FORM? Where an area of sea separates two plates, sediments settle on the sea floor in depressions called geosynclines. These sediments gradually become compressed into sedimentary rock. When the two plates move towards each other again, the layers of sedimentary rock on the sea floor become crumpled and folded. Eventually the sedimentary rock appears above sea level as a range of fold mountains.



MORE ABOUT FOLD MOUNTAIN •Compressional forces in continental collisions may cause the compressed region to thicken and fold, with material forced both upwards and downwards. •Since the less dense continental crust "floats" (cf iceberg) on the denser mantle rocks beneath, the weight of any crustal material forced upward to form hills, plateaus or mountains must be balanced by the buoyancy force (see isostasy) of a much greater volume forced downward into the mantle


MORE ABOUT BLOCK MOUNTAIN Block mountains are created when large areas are widely broken up by faults creating large vertical displacements. This occurrence is fairly common. The uplifted blocks are block mountains or horsts. The intervening dropped blocks are termed graben: these can be small or form extensive rift valley systems. This form of landscape can be seen in East Africa, the Vosges, the Basin and Range province of Western North America and the Rhine valley. These areas often occur when the regional stress is extensional and the crust is thinned.


MORE ABOUT VOLCANIC MOUNTAIN? Volcanoes are generally found where tectonic plates are diverging or converging. A mid-oceanic ridge, for example the Mid-Atlantic Ridge, has examples of volcanoes caused by divergent tectonic plates pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by convergent tectonic plates coming together. By contrast, volcanoes are usually not created where two tectonic plates slide past one another. Volcanoes can also form where there is stretching and thinning of the Earth's crust in the interiors of plates, e.g., in the East African Rift, the Wells Gray-Clearwater volcanic field and the Rio Grande Rift in North America

fold Block •Himalayas of Asia •Sierra Nevada mountain range of the western •Alps in Europe United States. volcanic •Mount Fuji in Japan •Mount Pinatubo in the Philippines


MORE ABOUT PLAINS? Plains occur as lowlands and at the bottoms of valleys but also on plateaus at high elevations. In a valley, a plain is enclosed on two sides but in other cases a plain may be delineated by a complete or partial ring of hills, by mountains or cliffs.

EXAMPLES OF PLAINS? •Prairies in U.S.A •West Siberian plains in Eurasia •Gangetic plains in India •Hawang ho plains in china •Po valley in Italy •Pampas in Argentina

This is grass plains


MORE ABOUT PLATEAU? 1. 2. 3. 4. 5. 6. 7. A plateau is a highland with steep slopes and a large summit area which rises abruptly from surrounding region. The surface of a plateau can be flat, rolling or even hilly. Plateaus occupy large portion of the earth surface Some plateaus are very large and extends over thousands of kilometers like Deccan plateau of INDIA Almost every continent has large plateaus They are located at semi arid and arid regions of the world Some of them are found near the tropics or on the leeward side of the mountain

MORE ABOUT INTERMONTANE PLATEAU? Intermontane plateau are the highest, largest and most complex in the world. They are partly or completely enclosed by mountain.

MORE ABOUT CONTINENTAL PLATEAU? Continental plateau are extensive tablelands which rise abruptly from the bordering lowlands or from the sea.

MORE ABOUT LAVA PLATEAU? Volcanoes also form several types of plateaus. The lava plateaus are formed by fissure flows. The total thickness and the area covered by the lava plateaus

Continental plateau

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