What is
Contraction
Evaporation
Expansion
Melting

↵Dear Student,

Please find below the solutions of your asked queries:

• Contraction: Contraction is  the decreasing of size in solids when cooled. It occurs when the temperature decreases.
• Evaporation: Changing of a liquid into gaseous form is called evaporation. In this method the mixture is heated. The liquid part of the mixture evaporates and escapes, leaving the solid part behind. For example- a mixture of common salt and water can be separated by evaporation.
• Expansion: It is a phenomenon which involves the action of becoming larger or spreading out or an act of  relaxation or increase or enlargement. In expansion, a substance or nature is increased in shape, size, scope or quantity. It is just opposite to the contraction.
• Melting: The process of solid material changing to its liquid form is called melting. For example- Ice turning into water, Iron metal turning into iron ore (liquid form), etc.

Hope this information clears your doubts about the topic.

Looking forward to hear from you again!!

Regards