Question

Consider the following:
1. Electromagnetic radiation
2. Geothermal energy
3. Gravitational force
4. Plate movements
5. Rotation of the earth
6. Revolution of the earth

Which of the above are responsible for bringing dynamic changes on the surface of the earth?
(a) 1, 2, 3 and 4 only
(b) 1, 3, 5 and 6 only
(c) 2, 4, 5 and 6 only
(d) 1, 2, 3, 4, 5 and 6

Answer 1

Option D - 1, 2, 3, 4, 5 and 6

More Information

■ Dynamic changes on Earth surface :-

• Metamorphism of rocks occurs due to temperature change caused by electromagnetic radiation, which is essentially a dynamic change.

• The energy emanating from within the earth is the main force behind endogenic geomorphic processes. This energy is mostly generated by radioactivity, rotational and tidal friction and primordial heat from the origin of the earth. The process of cycle of erosion occurs due to it.

• Gravity being a directional force activates all downslope movements of matter also causes stresses on the earth’s materials.

• Plate movement results into continent building. This energy due to geothermal gradients and heat flow from within induces diastrophism and volcanism in the lithosphere.

• Rotation of the Earth induces Coriolis force in the mantle of the earth which leads to mantle convection. Hence, it induces a Coriolis force in it.

• Revolution of the earth causes changes in seasons which leads to changes on the earth’s surface such as landslides, earth flow, mud flow e.t.c causing dynamic changes.

_________

Answer 2

Option D

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