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The right option is; B. mass wasting  

A landslide is an example of mass wasting.

Mass wasting is the bulk movement of soil, sand, regolith, and rock downslope due to the force of gravity. A landslide is an example of mass wasting. Landslides occur in various environments that has steep or gentle slope gradients. Gravity is the major force that causes landslides, and it can also occur due to disturbance of slope, changes in groundwater, volcanic activity and earthquakes.


Mass wasting

Further Explanation:

The term landslide points out towards various other forms of mass wasting and that includes a wide range of ground movements. This phenomenon takes place almost at every part of the world. These forms of mass wasting include rock falls, mud flows as well as debris flows. Mass wasting takes place in variety of environments which is segregated by either steep or gentle steep gradients. The major force which is also known to be as the driving force behind these landslides is gravity but there are other reasons also involved behind mass wasting.  

Many a times, mass wasting or landslides are triggered by a specific event which can be a heavy rainfall, earthquake or a slop cut in order to build roads etc. Landslides usually take place when there is a portion of the slope goes through some process which may stable it or unstable it. This phenomenon takes place due to decrease in the shear strength of the slope material and when that materials fails to hold on to that slope, landslide takes place.  

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Answer Details:

Grade: High School

Chapter: Landslides

Subject: Geography

Keywords: Landslides, Mass wasting, slopes, earthquakes, rainfalls, material, involve, plastic, environment.