What is the cause of convection currents?(1 point)

Question

Responses
Heat from the outer core warms the mantle causing it to become less dense, rise, cool, and drop back down.
Heat from the crust warms the mantle causing it to become less dense, rise, and push up on the crust.
Heat from the outer core warms the crust causing it to become less dense, drop lower, and push down on the mantle.
Heat from the outer core warms the mantle causing it to become more dense, rise, cool, and drop back down.

Answer 1

Heat from the outer core warms the mantle causing it to become less dense, rise, cool, and drop back down.