Name four types of rocks that will bend even under low levels of stress. In a ne
ID: 106185 • Letter: N
Question
Name four types of rocks that will bend even under low levels of stress. In a near-surface environment, is granite more likely to bend or to break? Why? We can list and describe three types of stresses that rocks are subjected to. Label the three sets of stress types depicted by the arrows below. Folding of rocks is the result of ___ stress. Folds in the shape of arches are known as ___, while folds in the form of troughs are known as __. Draw a simple (two-dimensional) sketch of each in the space below. Include three rock layers in both fold sketches. Include appropriate symbols indicating shale, sandstone, and limestone (see fig. 9.11 in your textbook for examples).Explanation / Answer
3. i) Compressive stress: -------> <--------
Compressive stress is the stress on materials or rocks that leads to a smaller volume. By compressive stress the material is under compression. Compressive stress to bars, columns, etc. leads to shortening. One can increase the compressive stress until compressive strength is reached.
ii) Tensile stress: <--------- --------->
The tensile stress applied to a material or rock is the force per unit area applied to the material. The maximum stress a material can stand before it breaks is called the breaking stress or ultimate tensile stress. Tensilemeans the material is under tension. The forces acting on it are trying to stretch the material.
iii) Shear stress: -------------->
<---------------
A shear stress, often denoted (Greek: tau), is defined as the component of stress coplanar with a material cross section. Shear stress arises from the force vector component parallel to the cross section.
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