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| Q. |
Most of the devastating earth-quakes are usually caused by – |
| A. | Eustatic movement |
| B. | Isostatic adjustment |
| C. | Collision of earth plates |
| D. | Volcanic eruption |
| Answer» C. Collision of earth plates | |
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Explanation: An earthquake is the result of a sudden release of enemy in the Earth's crust that creates seismic waves. The world's earthquakes are not randomly distributed over the Earth's surface. They tend to be concentrated in narrow zones. An explanation is to be found in plate tectonics, a concept which has revolutionized thinking in the Earth's sciences. Plate tectonics tells us that the Earth's rigid outer shell (lithosphere) is broken into a mosaic of oceanic and continental plates which can slide over the plastic asthenosphere, which is the uppermost layer of the mantle. |
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