CH 7 OUR COUNTRY – INDIA

Moraine.

Cliff.

Ox-Bow Lakes When the meander loop is cut-off from the main river, it forms a cut-off lake. Its shape is like an ox-bow. Hence, the cut-off lake is called ox-bow lake.

Formation of Beaches Sea waves strike the coasts. They erode the coasts and carry the eroded material in the form of silt and other material. When they withdraw they deposit the silt and other material (sediments) along the shore, forming wide beaches.

Sand DunesSand dunes are heaps of sand deposited at a place by the wind’s action in thedesert areas.

Flood plains are formed in the following manners: During rains rivers overflow their banks. This leads to the flooding of the nearby areas. After the flood has receded, a layer of fine material and other material is deposited over the plain in the form of sediments. This leads to the formation of the flood plain.

ErosionErosion is the wearing away of the landscape by different agents like running water, glacier, wind, ground water and sea waves.

Plates move due to the movement in the molten magma found in the interior of the earth. Exogenic Forces Exogenic forces are those forces which act on the surface of the earth and causechanges on the surface of the earth.Examples: Weathering, gradation, erosion, deposition. Endogenic Forces Endogenic forces are those forces which originate in the interior …

Why do the plated move? Read More »

The oceanic crust is subducted under the continental as it is naturally denser than the continental crust. When a continental plate collides with an oceanic plate, the oceanic plate crust subducts beneath the continental crust due to its high density and its higher specific gravity, thus forming a subduction zone.

Geologic processes such as plate tectonics impact the entire surface of the planet and have major influences on the location of natural hazards like earthquakes and volcanoes. So far, we have only studied large scale patterns in plate tectonics.