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What needs to be added or taken away to cause a change in state?

One change of state happens when you add energy to the substance. This change of state is called melting. By adding energy to the molecules in a solid the molecules begin to move quicker and can break away from the other molecules.

In his prison cell at Nuremberg, Hitler's foreign minister, Joachim von Ribbentrop, wrote a brief memoir in the course of which he explored the reasons for Germany's defeat. He picked out three factors that he thought were critical: the unexpected 'power of resistance' of the Red Army; the vast supply of American armaments; and the success of Allied air power.

Explanation: