Civil Services Prep

Prelims 2013 · Geography · Question 68

Consider the following:<br/>1. Electromagnetic radiation<br/>2. Geothermal energy<br/>3. Gravitational force<br/>4. Plate movements<br/>5. Rotation of the earth<br/>6. Revolution of the earth<br/><br/>Which of the above are responsible for bringing dynamic changes on the surface of the earth?

  1. 1, 2, 3 and 4 only
  2. 1, 3, 5 and 6 only
  3. 2, 4, 5 and 6 only
  4. 1, 2, 3, 4, 5 and 6

Answer

1, 2, 3, 4, 5 and 6

1. Electromagnetic radiation — Solar radiation is the basic source of energy for atmospheric processes, weathering, winds and the hydrological cycle. Correct.

2. Geothermal energy — Internal heat drives volcanism, metamorphism and endogenic processes. Correct.

3. Gravitational force — Gravity causes mass wasting, runoff and also influences tides. Correct.

4. Plate movements — Tectonic plate motion causes earthquakes, mountain building and volcanism. Correct.

5. Rotation of the earth — Rotation produces day-night cycle and Coriolis effect, shaping winds and ocean currents. Correct.

6. Revolution of the earth — Revolution with axial tilt causes seasons, affecting insolation and climatic changes over the surface. Correct.

Since all six contribute to dynamic changes on the earth's surface, the correct answer is (d) 1, 2, 3, 4, 5 and 6.

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