The right option is; slab-pull
The main source of downward convection flow in the mantle is called slab pull.
Slab-pull is the force applied by a cold, dense oceanic plate descending into the mantle as a result of its own weight. This process is known as subduction. The oceanic plate has a density higher than that of the hotter mantle below it and the difference in their density causes the plate to submerge into the mantle.
The main source of downward convection flow in the mantle is called slab pull.
Further Explanation:
The earth is interiorly divided into three parts, namely the crust, mantle and core. The mantle is the most solid bulk of Earth's interior that lies between the core (which is generally very hot liquid due to molten lava) and the crust (which is generally solid because it is exposed to cooler temperatures on the outermost region).
When a fluid moves in bulk, the mass that is transferred due to this motion is known as convection. downward convection is the natural convection type which is produced by a plate that faces upward and is cooler than the fluid or a plate that faces downward and is warmer than the fluid.
A typical slab pull is a force that is applied by the oceanic plate that is dense and low in temperature into the mantle because of its weight. The process is known as subduction. The density of the oceanic plate as compared to the hot mantle is higher and this difference leads to the submergence of the plate into the mantle.
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Answer Details:
Grade: High School
Subject: Biology
Topic: Earth's interior
Keywords:
Earth, crust, mantle, core, oceanic plate, density, fluid, bulk, slab pull, convection.
