Question

________ is the constructive effect of earthquakes.
A.Formation of Coastal Plains
B.Submergence of Coastal Plains
C.Both a and b
D.None of these.

Answer 1

Hint: Constructive effects of earthquakes can be defined as the release of energy and the creation of new landforms. Unlike the destructive effects of earthquakes, in constructive effect, it assists the Earth in the freeing up of stored up energy that keeps the planet in an adequate structure. The movement of the earth’s crust can result in the formation of new landforms, like lakes, raising the lower-lying parts of the earth, etc.

Complete answer:
Formation of new Coastal plains: The formation of the new coastal plains is a result of the movement of the earth’s crust which causes an effect of vertical and lateral displacement. This leads to the rise of the low-lying ocean floor near the seashore establishing new coastal plains.

Submergence of Coastal Plains: The submergence of coastal plains is a constructive effect of an earthquake. It results in the emergence of new bays and gulfs which act as an important part of the establishment of port harbors useful for trade.

Both a and b: Formation of new Coastal Plains and Submergence of Coastal plains are both the constructive effects of an earthquake.

None of these: Formation of new Coastal Plains and Submergence of Coastal plains are the constructive effects of an earthquake.

Hence, the correct answer is option (C).

Note:Coastal plains can take a lot of time to be formed. Earthquakes can also create hot springs and geysers which are useful for humans. In contrast to constructive effects, destructive effects lead to the collapse of property, loss of life, change in river course, etc.