Convection currents happens in earth's mantle because of the heat from the core and the mantle.
What is convection currents?
Convection current is a flow of a fluid or air due to heating and cooling of the fluid or air. Convection currents are identified in the Earth's mantle. Heated mantle material rises from the deep part of the mantle, and mantle material with low temperature sinks, generating convection. This type of current is believed to be responsible for the movement of Earth's crustal plates.
In the ocean, warm water is usually found near the surface, while cold water is usually found at depth. Deep cold water currents play a key role in creating the cinematic ocean oasis.
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