EARTH SCIENCE
EARTHQUAKES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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when the rock does not turn back to its normal shape when stress is taken away
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when the rock turns back to its original shape after the stress is taken away
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when the rock breaks
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None of the above
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Detailed explanation-1: -Fractures are mechanical breaks in rocks involving discontinuities in displacement across surfaces or narrow zones. Fracture is a term used for all types of generic discontinuities.
Detailed explanation-2: -A crack refers to a break or brittle discontinuity on a surface that causes the surface to get torn open as the crack is created. These cracks in rocks are called fractures. Faults are fractures formed on the crust of the Earth where the cracks have caused the sides of the rocks to slide past each other.
Detailed explanation-3: -A fault is a fracture or zone of fractures between two blocks of rock. Faults allow the blocks to move relative to each other. This movement may occur rapidly, in the form of an earthquake-or may occur slowly, in the form of creep. Faults may range in length from a few millimeters to thousands of kilometers.
Detailed explanation-4: -Fractures are mechanical breaks in rocks; they originate from strains that arise from stress concentrations around flaws, heterogeneities, and physical discontinuities. They form in response to lithostatic, tectonic, and thermal stresses and high fluid pressures.