6. Convection Current Theory & Sea Floor Spreading Theory Flashcards

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1
Q

Who proposed the Convection Current Theory and in what year?

A

Arthur Holmes proposed the Convection Current Theory in 1930.

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2
Q

What elements are present in the mantle that generate energy and increase heat?

A

Vast radioactive elements are present in the mantle that generate energy and increase heat.

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3
Q

What happens in the mantle as a result of the increased heat generated by radioactive elements?

A

The increased heat forms molten rocks and leads to the rise and formation of magma in the mantle.

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4
Q

What is the process called when the Earth’s crust bends, and what forms as a result?

A

The process is called warping, and ridges form in the crust as a result.

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5
Q

What causes the lithospheric plate to start moving, and what geological features are formed due to subduction?

A

The lithospheric plate starts moving due to low pressure in the lithosphere and the hot mantle plume beneath it. Subduction causes the lithospheric plate to bend and forms trenches.

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6
Q

What happens to magma that gets cold due to subduction, and what is this cycle known as?

A

The cold magma re-enters the mantle and starts heating again, forming a cycle known as the convection cell.

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7
Q

What generates conventional current in the mantle, and what is its significance?

A

Thermal differentiation generates conventional current in the mantle, which is the primary driver for the movement of the lithosphere.

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