What happens when two objects at different temperatures touch ? name one place where it occurs in earth system

The correct answer to this open question is the following.

What happens when two objects at different temperatures touch is that a colder object makes contact with a hot ter object, and the hot object transfers heat to the cold object. Which means that there is a transfer of energy between the two. It could be by conduction or convection means. This phenomenon can be appreciated when hot ocean currents crash into the cold oceanic current in the seas of planet earth.

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