Question

We know that the Earth's crust is composed of plates. There is also evidence that these plates move. But how? Some of these statements correctly describe the mechanisms behind plate movement.

Can you identify the statements that correctly describe the movement of tectonic plates on Earth?

Earth's interior is heated by radioactive decay of elements such as uranium, thorium, and potassium.
The Earth's iron-nickel core generates electricity, which in turn generates heat.
Under Earth's crust is a malleable layer of heated rock known as the asthenosphere
Magma continuously wells upwards at the mid-oceanic ridges producing currents of magma flowing in opposite directions.
When tectonic plates meet they always crumple and fold stopping the movement and create mountains.
The asthenosphere circulates as convection currents underneath the solid lithosphere.

Answer 1

• Earth's interior is heated by radioactive decay of elements such as uranium, thorium, and potassium.
• Under Earth's crust is a malleable layer of heated rock known as the asthenosphere
• The asthenosphere circulates as convection currents underneath the solid lithosphere.

Explanation:

The asthenosphere is the upper part of the mantle that has the property of semi-plasticity. It is the layer that has convention current responsible for tectonic plate movement. The lower regions of the layer are heated more by the heat from the core and become less dense. The layers from the bottom rise and the cooler upper layers sink to the bottom. This cycle continues just like any other convection currents in a fluid.

As these convection currents churn about, they drag the lithosphere above, at the lithosphere–asthenosphere boundary, by the force of drag.

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Answer 2

The mechanisms behind plate movement in the Mantle layer includes

• Under Earth's crust is a malleable layer of heated rock known as the asthenosphere.
• The asthenosphere circulates as convection currents underneath the solid lithosphere.

The asthenosphere which is the upper part of the mantle is responsible for tectonic plate movement.

The lower regions of the asthenosphere are heated more by the heat from the core and thus, become less dense.

The layers from the bottom of the Mantle rises and the upper layers which are cooler sink to the bottom and this cycle continues like that.

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