6. Convection Current Theory & Sea Floor Spreading Theory Flashcards
Who proposed the Convection Current Theory and in what year?
Arthur Holmes proposed the Convection Current Theory in 1930.
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What elements are present in the mantle that generate energy and increase heat?
Vast radioactive elements are present in the mantle that generate energy and increase heat.
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What happens in the mantle as a result of the increased heat generated by radioactive elements?
The increased heat forms molten rocks and leads to the rise and formation of magma in the mantle.
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What is the process called when the Earth’s crust bends, and what forms as a result?
The process is called warping, and ridges form in the crust as a result.
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What causes the lithospheric plate to start moving, and what geological features are formed due to subduction?
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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What happens to magma that gets cold due to subduction, and what is this cycle known as?
The cold magma re-enters the mantle and starts heating again, forming a cycle known as the convection cell.
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What generates conventional current in the mantle, and what is its significance?
Thermal differentiation generates conventional current in the mantle, which is the primary driver for the movement of the lithosphere.
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