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Geography Paper- 1

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Endogenetic and Exogenetic Forces



Origin and Evolution of the Earth’s Crust and its surface area unit perpetually evolving (changing) because of varied forces emanating from below (endogenic forces) additionally as higher than the surface of the planet (exogenic forces).

These forces cause physical and chemical changes to the geomorphic structure (earth’s surface).

Some of these changes area unit observably slow (e.g. weathering, folding), some others area unit gradual (e.g. erosion) whereas the remaining area unit quite sudden (earthquakes, volcanic eruptions).

Endogenetic force

Endogenetic force area unit forces ensuing from dynamic processes operative to a lower place the crust of the planet. Endogenic forces an area unit usually classified as slow movements (diastrophic) and sudden movements. Slow movements cause changes terribly bit by bit that couldn’t be visible throughout somebody’s time period. They cause:

  • Diastrophism: Lifting of associate degree oversized an area of the crust in elevation
  • Orogeny: Folding, warping, faulting among the crust which might occur as a results of geological process.
  • Volcanism: a method whereby liquefied rock material from to a lower place the crust pushes through the crust and builds up the surface of the globe .

Classification of Endogenic movements

  • Endogenic movements divided into diastrophic movements and unforeseen movements.
  • geological process refers to deformation of the Earth’s crust.
  • Diastrophic movements are gradual and might stretch for thousands of years.
  • Diastrophic movements are gradual and may stretch for thousands of years.
  • On the other hand, unforeseen movements like earthquakes and volcanic eruptions occur throughout a very short amount.

Slow Movements (Diastrophic forces)

Diastrophic forces refers forces generated by the movement of the solid material of the earth’s crust. All the processes that move, elevate or build parts of the earth’s crust come back underneath geological process. geological process includes

(i) Orogenic processes involving mountain building through severe folding and poignant long and slender belts of the earth’s crust.

(ii) Epeirogenic processes involving uplift or deformation of enormous elements of the earth’s crust.

(iii) Earthquakes involving native comparatively minor movements.

(iv) Geomorphology involving horizontal movements of crustal plates.

Slow movements will once more be classified as vertical movements and horizontal movements.

Vertical Movements (Epeirogenic movements)

  • Vertical movements in the main related to the formation of continents and plateaus. They additionally referred to as as Epeirogenic movements
  • The broad central elements of continents referred to as cratons and subject to epeirogeny.
  • They do not bring any changes within the horizontal rock strata.
  • While they cause upliftment of continent, they’ll additionally cause subsidence of continent.
  • These movements originate from the centre of the planet.

Horizontal Movements (Orogenic Movements)

  • Horizontal forces acts on the earth’s crust from aspect to aspect to cause these movements.
  • They additionally called orogenic movements (mountain building).
  • These movements bring loads of disruptions to the horizontal layer of strata resulting in an oversized structural deformation of earth’s crust.
  • They can be classified as forces of compression and forces of tension.

Sudden Movements

Sudden geomorphic movements occur principally at the lithospheric plate margins (tectonic plate margins). The plate margins area unit extremely unstable regions because of pressure created by pushing and propulsion of rock within the mantle (convectional currents). These movements cause respectable deformation over a brief amount. Examples: Volcanoes and earth quakes.

Exogenetic forces

Exogenetic forces are the forces that job from outside the earth. Landforms (often plains or minor landforms) created from forces outside the earth that touch the surface and alter it.

  • Weathering: the breaking down of rock by chemical and/or mechanical means that into smaller particles in preparation for subsequent two forces.
  • Erosion: the removal of weather-beaten materials from higher elevations by moving water, wind, moving ice, and/or gravity.
  • Deposition: the build from weather-beaten materials at lower elevations once the force of gravity can’t be overcome by AN agent of abrasion.

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