INDIAN GEOGRAPHY

THE EARTH

INTERNAL STRUCTURE OF EARTH

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
_________ of mental material produces convection currents beneath the surface of the earth.
A
Heat
B
Density
C
Circular motion
D
Horizontal movement
Explanation: 

Detailed explanation-1: -Mantle convection is the very slow creeping motion of Earth’s solid silicate mantle as convection currents carry heat from the interior to the planet’s surface.

Detailed explanation-2: -Convection currents transfer hot, buoyant magma to the lithosphere at plate boundaries and hot spots. Convection currents also transfer denser, cooler material from the crust to Earth’s interior through the process of subduction.

Detailed explanation-3: -Convection currents are circular patterns that move air and liquids as a result of unequal heating and cooling. Hot air rises because it is less dense and then sinks as it cools.

Detailed explanation-4: -Convection currents are heat-driven cycles that occur in the air, ocean, and mantle. They are caused by a difference in temperature, often due to a differing proximity to a heat source. The difference in temperature relates directly to the density of the material, causing this effect.

Detailed explanation-5: -Plate tectonics is the expression of mantle convection at the Earth’s surface. The horizontal motions of the plates are the near-surface horizontal movements of the convecting mantle. Subduction zones mark the surface locations of mantle downflow with the descending slabs being the convective downflow elements.

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