How do you change a solid into a liquid?

you melt it

Explanation:

You change a solid to a liquid by melting it.

for example ice becomes a liquid by melting.

Heat is probably the easiest energy you can use to change your physical state. The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid.

Explanation:

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

he would use the colour black