■ ENDOGENETIC GEOMORPHIC MOVEMENTS

#Geomorphology #Earthmovements

◇ The large-scale movements on the earth’s crust or its surface brought down by the forces emanating from deep below the earth’s surface are called as endogenic geomorphic movements or simply endogenic movements (endo: internal; genic: origin; geo: earth; morphic: form).

◇ The geomorphic processes that are driven by the forces emanating from deep below the earth’s surface are called endogenic geomorphic processes (folding, faulting, etc.).

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■ FORCES BEHIND ENDOGENIC MOVEMENTS

#Geomorphology #Earthmovements

◇ The ultimate source of energy behind forces that drive endogenic movements is earth’s internal heat.

◇ Earth’s internal heat is a result of mainly radioactive decay (50% of the earth’s internal heat) and gravitation (causes pressure gradients).

◇ Differences in temperature and pressure (temperature gradients or geothermal gradients and pressure gradients) among various layers of the earth give rise to density differences and these density differences give rise to conventional currents.

◇ Convectional currents in the mantle drive the lithospheric plates (crust and upper mantle) and the movement of the lithospheric plates (tectonics) is the cause behind endogenic movements.

◇ The Earth’s rotation (Coriolis effect) can influence where convection currents travel.

◇ The destination of convection currents determines the nature and location of the endogenic movements.

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■ DIASTROPHISM

#Geomorphology #Earthmovements

◇ Diastrophism refers to deformation of the Earth's crust due to diastrophic movements (deforming movements) such as folding, faulting, warping (bending or twisting of a large area) And fracturing.

◇ All processes that move, elevate or build up portions of the earth’s crust come under diastrophism.

□ They include :-

• orogenic processes - involving mountain building through severe folding (crust is severely deformed into folds) and affecting long and narrow belts of the earth’s crust.

• epeirogenic processes - involving uplift or warping of large parts of the earth’s crust (simple deformation);

• earthquakes and volcanism involving local relatively minor movements;

• plate tectonics involving horizontal movements of crustal plates.

◇ The most obvious evidence of diastrophic movement can be seen where sedimentary rocks have been bent, broken or tilted.

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