SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When magma is heated, it becomes more dense and sinks. When magma is cooled, it becomes less dense and rises.
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When magma is heated, it becomes less dense and sinks. When magma is cooled, it becomes more dense and rises.
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When magma is heated, it becomes more dense and rises. When magma is cooled, it becomes less dense and sinks.
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When magma is heated, it becomes less dense and rises. When magma is cooled, it becomes more dense and sinks.
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Detailed explanation-1: -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-2: -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-3: -The mantle is heated from below (the core), and in areas that are hotter it rises upwards (it is buoyant), whereas in areas that are cooler it sink down.
Detailed explanation-4: -Convection Currents The core’s heat energy is transferred to the mantle, causing it to rise towards the Earth’s surface, which is cooler. As the heated mantle transfers its heat energy to the lithosphere, it becomes more dense than the surrounding magma and sinks back down towards the core.
Detailed explanation-5: -Mid-ocean ridges: Rising rocks in mantle convection cell bring heat near the surface, transfering heat to overlying rocks.