What causes the plastic motion in the mantle?

What causes the plastic motion in the mantle?

Mantle convection is the slow, churning motion of Earth’s mantle. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense.

What is plasticity in earth?

plasticity, ability of certain solids to flow or to change shape permanently when subjected to stresses of intermediate magnitude between those producing temporary deformation, or elastic behaviour, and those causing failure of the material, or rupture (see yield point).

Which layer of the mantle exhibits plasticity?

The asthenosphere is solid upper mantle material that is so hot that it behaves plastically and can flow. The lithosphere rides on the asthenosphere.

How might the plasticity of the Earth’s mantle influence the movement of the Earth’s lithospheric plates?

How might the plasticity of the mantle influence the movement of the Earth’s lithospheric plates? Because the mantel is always moving, ever so slowly, so do the plates because they are on top of the mantle. When do convection currents form? When lese dense warmer air rises above more dense cooler air.

What layer of the Earth has plasticity?

The asthenosphere is a shallow layer of the upper mantle. The asthenosphere, which lies directly below the lithosphere, is also solid. However, the asthenosphere is less rocky and rigid than the lithosphere above. The asthenosphere has plasticity.

What causes plastic deformation?

Plastic deformation is the permanent distortion that occurs when a material is subjected to tensile, compressive, bending, or torsion stresses that exceed its yield strength and cause it to elongate, compress, buckle, bend, or twist.

What causes the formation of the weak layer of rocks in the upper mantle just beneath the lithosphere?

The asthenosphere is the denser, weaker layer beneath the lithospheric mantle. It lies between about 100 kilometers (62 miles) and 410 kilometers (255 miles) beneath Earth’s surface. The temperature and pressure of the asthenosphere are so high that rocks soften and partly melt, becoming semi-molten.

What layer of the Earth has plasticity and convection currents?

Terms in this set (32) the mantle layer of semi-solid rock that flows with convection currents beneath the lithosphere. It has the property of “plasticity”, like oobleck or slime.

Where does plastic deformation occur?

Plastic deformation occurs when a material is stressed above its elas- tic limit, i.e. beyond the yield point, as illustrated in Figure 1. The resulting plastic deformation is permanent and cannot be recovered by simply removing the stress that caused the deformation.

Why does plastic deformation lead to work hardening?

Work hardening, also known as strain hardening, is the strengthening of a metal or polymer by plastic deformation. This strengthening occurs because of dislocation movements and dislocation generation within the crystal structure of the material.