The strength of the underlying geology, steepness of hillsides and faults in the Earth's crust which can potentially cause earthquakes are the geologic considerations during the identification of physically safe places for human habitation.
Geology basically deals with the study of the Earth and it finds a vital application in understanding the physical features of an area before it is inhabited by humans.
Human habitation on steep hillsides can be risky due to potential landslides and soil erosion which may occur due to rainfall or by rivers. It is also important to judge the strength of the underlying geology to ensure stability to the structures and buildings made to support habitation. The faults in the Earth's crust and the movement of the tectonic plates are responsible for causing Earthquakes. Seismic activity can lead to swaying of the structures and result in their instability which happens to risk human lives.
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