* Action Verbs: These verbs describe an action that someone or something does. They answer the question "What is happening?" Examples: run, jump, eat, sing, write.
* "Hair melt": This phrase is not a verb at all. It describes a state of being (hair melting). It's not something someone or something can actively do.
* "Sky": This is a noun, a word that names a person, place, or thing. It doesn't describe an action.
To make these into action verbs, you could:
* "Melt": This is an action verb. You could say "The heat melts the ice cream."
* "Soar": This action verb can be used to describe the sky. You could say "The birds soar through the sky."