Answer :
Answer: B. Mass movement always leads to landslides.
Mass movement or mass wasting is a process in which rocks, stones, debris or sediments are forced downward the hill or slope with respect to the action of gravity. Mass movement does not always leads to landslides as it depends upon the density of moving material going down the slope. The heavier and denser the material, the more profound will be the affect resulting in landslide but lighter material cannot cause landslide.
Option (B) is correct. The mass movement does not always lead to landslides.
Further Explanation:
The mass movement is the shifting of a huge amount of mass under the various actions of the physical factors like heat and temperature, gravitational pull etc. The mass movement occurs in the areas of light altitude due to several human factors also.
The mass movement is mostly the natural process and it occurs at such a slow rate that it is almost impossible to visualize the mass movement.
The mass movement of a huge lump of mass accumulated at a higher altitude is mostly due to the gravitational pull acting on the objects. This gravitational pull forces the mass to move from one point to other.
The mass accumulated at a particular point will always move in the downward direction under the pull of the gravity. Therefore, due to this pull, the mass movement is always down the slope.
The most frequent outcome of the mass movement is the landslide but we cannot say that the mass movement always leads to the landslides because sometimes, it is just the small movement of the mass from the high altitude and does not brig the huge amount of mass which is termed as landslide.
Thus, Option (B) is correct. The mass movement does not always lead to landslides.
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Answer Details:
Grade: Middle School
Subject: Physics
Chapter: Gravitation
Keywords:
Mass movement, landslides, brevity, gravitational pull, driving force, down slope, high altitude, mass accumulated, temperature, force of gravity.