Question

Which of the following comes under the phenomena of mass movement?
A.Soil Creep
B.Landslide
(A) Only A
(B) Only B
(C) Both A and B
(D) None of these

Answer 1

Hint: Mass Movement is also known as Mass Wasting. Mass Movement is mainly caused due to the effect of gravity. Mudflow, Landslides, Flow of rocks, water are all examples of a mass movement.

Complete answer: Before proceeding to the phenomena of a mass movement, we must be aware of what the mass movement is. It is the down-falling of the rocks and muds from a great height probably from the mountains and any higher area. There are many reasons due to which mass movement takes place. Some of which are bad weather, the quality of rocks which means old and weak rocks has higher chances of falling instead of the new rocks, the area having a higher slope, earthquakes and even high-pressure difference supports the phenomena of a mass movement. Both the Soil Creep and Landslide are types of a mass movement.
Soil Creep: Soil Creep are the Downhill Creeps which are caused mostly in the rainy season. It is the slow movement of soil on a filthy surface. It generally occurs at low slope areas and it is a continuous process and hence needs a lot of time.
Landslides: It is the falling down of rocks, stones and mud from a great height under the influence of gravity. Factors like earthquakes and rainfall increase the chances of landslides. Other Natural Factors include bad weather, an increase of pressure, rise of groundwater.

Hence, Option (C) is correct.

Note: Angle of Repose decides the speed of movement of the particles of soils and muds. There are very little chances of mass wasting in the areas where the quantity of vegetation is high. Slumps are also a kind of mass movement.