EARTH SCIENCE
EARTHQUAKES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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when rocks are pulled apart
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when rocks fold or break
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a rock deep underground is pushed by weight above it, rock cannot move, it cannot deform
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parallel forces move in opposite directions
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Detailed explanation-1: -Rocks that are pulled apart are under tension. Rocks under tension lengthen or break apart. Tension is the major type of stress at divergent plate boundaries. When forces are parallel but moving in opposite directions, the stress is called shear (figure 2).
Detailed explanation-2: -Stress causes the build up of strain, which causes the deformation of rocks and the Earth’s crust. Compressional stresses cause a rock to shorten. Tensional stresses cause a rock to elongate, or pull apart. Shear stresses causes rocks to slip past each other.
Detailed explanation-3: -When an object is pulled apart by a force it will cause elongation which is also known as deformation, like the stretching of an elastic band, it is called tensile stress. But, when the forces result in the compression of an object, it is called compressive stress.
Detailed explanation-4: -1) tension This force pulls rocks apart and creates a normal fault.