Dear Ijaz,

I think both endogenic and exogenic processes are about equal in bringing natural disasters. The following text gives definition and examples for these two processes:

Processes that are caused by forces from within the Earth are endogenous processes. By contrast, exogenous processes come from forces on or above the Earth's surface. There are three main endogenous processes: folding, faulting and volcanism. They take place mainly along the plate boundaries, which are the zones that lay on the edges of plates. These zones are weak. Endogenous processes cause many major landform features.

Many exogenous forces are as a result of other bodies in space. For example, the Moon causes tides in the Earth's oceans and other big bodies of water. Impacts from comets and meteoroids change the surface of the Earth. When they strike the Earth, they create craters which are holes, which can be very big or small, in the ground. Radiation from the Sun can cause aurorae, which are lights that can be seen at night near the poles. An example of an exogenous process that is not as a result of bodies in space is erosion. Erosion happens as a result of wind, water, ice, or people, animals, or plants digging in the Earth. Some other examples of exogenous process are rainfall, snowfall, hailstorm, erosion ,tsunamis, avalanches, winds, wave currents etc.

For more on endogenous processes such as Earth quakes and volcanoes and exogenous processes such as weathering, mass wasting, erosion and deposition, please see the following links:

https://www.academia.edu/7001138/TECTONIC_EARTHQUAKE_AND_VOLCANIC_PROCESSES

https://simple.wikipedia.org/wiki/Endogenous_and_exogenous

http://vudeevudeewiki.blogspot.com/p/endogenic-and-exogenic-processes.html

http://www.clearias.com/exogenic-forces/

http://study.com/academy/lesson/the-dynamic-earth-internal-external-forces-that-shape-earth-surface.html

http://www.design4disaster.org/disasters-2/natural-disasters/exogenic-disasters-impact-event/

Hoping this will be helpful,

Rafik

As already answered by Dr. Karaman, both endogenic and exogenic processes seem to be about equal in bringing natural disasters. See the following link (clicking the link shows page 447 of the book):

https://books.google.co.jp/books?id=JQ8DPauYIOYC&pg=PA447&lpg=PA447&dq=natural+disaster,+endogenic+processes+or+exogenic+processes&source=bl&ots=HHzr53BLRr&sig=yyL6wxhCqyhw9ERNa8gi2BpUQ80&hl=en&sa=X&ved=0ahUKEwj02sSilsrPAhVKKZQKHcnHBA8Q6AEIPzAG#v=onepage&q=natural%20disaster%2C%20endogenic%20processes%20or%20exogenic%20processes&f=false