How is heat transferred from one place to another by convection?

Answer 1

Heat is transfered through convection by convection currents.

Think about a baloon, the baloon is dense because it is not blown up yet. This represents the cold air in a convection current, it is dense, so it falls. Now if we blow the baloon up, it expands and becomes less dense, so it floats above the air around it. This represents the hot air, it too expands and becomes less dense, so it rises above cold air. This is why heat is always greater the higher you are in a room. Eventually, the baloon will deflate and fall to the ground, the same as it started. This happens to the hot air, it even tually cools and goes down. Although unlike the baloon, the cycle repeats again and again.

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Answer 2

It can be explained by the fact in order to melt some ice you have to "pump" some thermal energy in the system. And because all the energy is spent to break the ice crystal structure there is nothing left to increase the temperature of the system.