Geography Education

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Geography Education - YouTube Learn Geography and become addicted to the world.We are the ambassadors of nature * Physical Geography * Human and Regional Geography * Practical Geography

■ EXFOLIATION DUE TO PRESSURE RELEASE OR UNLOADING



◇ Intrusive igneous rocks formed deep beneath the Earth's surface are under tremendous pressure due to overlying load.

◇ Removal of the overlying load because of continued erosion causes vertical pressure release with the result that the upper layers of the rock expand and fracture parallel to the surface.

◇ Over time, sheets of rock break away from the exposed rocks along the fractures, a process known as exfoliation.

◇ Exfoliation due to pressure release is also known as "sheeting".

■ GEOMORPHIC MOVEMENTS



◇ Earth’s crust and its surface are constantly evolving (changing) due to various forces emanating from below (endogenic forces) as well as above the surface of the earth (exogenic forces).

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

◇ Some of these changes are imperceptibly slow (e.g. weathering, folding), some others are gradual (e.g. erosion) while the remaining are quite sudden (earthquakes, volcanic eruptions.

◇ Geomorphic: relating to the form of the landscape and other natural features of the earth's surface.

◇ Geomorphic agents: mobile medium (like running water, moving ice masses or glaciers, wind, waves, currents etc.) which removes, transports and deposits earth materials.

◇ Geomorphic processes: physical and chemical processes that take place on the earth’s surface (folding, faulting, weathering, erosion, etc.) due to endogenic and exogenic forces.