EARTH SCIENCE
TECTONICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hot rock becomes less dense and starts to move in the direction of the outer core.
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Hot rock expands, becomes more dense, and rises toward the surface of the Earth.
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Hot rock expands, becomes less dense, and rises toward the surface of the Earth.
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Hot rock becomes more dense and starts to move in the direction of the outer core.
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Detailed explanation-1: -The main heat transfer mechanism in the Earth’s mantle is convection, a thermally driven process where heating at depth causes material to expand and become less dense, causing it to rise while being replaced by complimentary cool material that sinks.
Detailed explanation-2: -The lower mantle is heated directly by conduction from the core. In conduction, heat is transferred as atoms collide. The rising and sinking of warm and cooler material is called convection. Conduction brings hot material up toward the surface.
Detailed explanation-3: -This material moves into the mantle above the plate and causes the mantle to melt. This liquid rock, called magma, rises to the surface because it is less dense then the surrounding rock. If the magma reaches the surface of the Earth, a volcano forms. As the mantle rocks melt they form magma.
Detailed explanation-4: -Mantle convection describes the movement of the mantle as it transfers heat from the white-hot core to the brittle lithosphere. The mantle is heated from below, cooled from above, and its overall temperature decreases over long periods of time. All these elements contribute to mantle convection.
Detailed explanation-5: -As hot material rises from the lower mantle into the upper mantle, its cooler material sinks into the lower mantle. This movement causes the tectonic plates to shift. The tectonic plates sit above the mantle because they are less dense; this phenomenon is known as isostasy.