Heat is nothing more than jiggling atoms. The more atoms wiggle and jiggle, the more heat they make. When atoms jiggle a lot (get hot) they bump into each other and push each other apart. A place that is hot has fewer atoms than a place that is cold because its atoms are wiggling more. A place that is hot, because it has has fewer atoms, weighs less (it is less dense) than a place that is cold.
The second law is about convection. Convection explains how heat (jiggling atoms) moves around in a fluid, such as water, or air, or silly putty. The atoms, and the heat, always move from where it is hot and less dense (big jiggles) to where it is cold and more dense (little jiggles). Heat also moves from a place that is more dense (colder, smaller jiggles) to a place that is less dense (warmer, larger jiggles).

Convection always moves in a loop. Atoms move from a place that is less dense to a place that is more dense, and from more dense to less dense.

That was a heavy duty science lesson. I'll let the storyteller tell you how heat can move a continent.

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