sentences: heat is a kind of heat energy & heat energy can change the state of matter ->  heat can change the state of matter  heat can change the state of matter & liquid is a kind of state of matter & solid is a kind of state of matter ->  heat can change a substance from a solid to liquid  heat can change a substance from a solid to liquid & melting means a substance changes from a solid into a liquid by increasing heat energy ->  heat can cause a solid substance to melt  heat can cause a solid substance to melt & ice is a kind of solid ->  heat can cause ice to melt  heat can cause ice to melt & a car engine is a source of heat -> the heat from a car engine can cause ice to melt