C.when warm material in the mantle rises upto the surface (ground) it will cool and sinks,these cooled materials will eventually be turned in to Land mass
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The mantle is composed of solid peridotite. Conduction from the core heats the lower mantle. Mantle convection brings hot material up towards the surface and brings cooler material down towards the core. Hot lower mantle rises up and as it rises it cools down and moves horizontally. Overtime it becomes cool and dense and then finally sinks. The rising and sinking of warm and cooler material is known as convection.
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