heat energy can change the state of matter & heat is a kind of heat energy ->  heat can change the state of matter  heat can change the state of matter & solid is a kind of state of matter & liquid 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 & the sun is a source of radiation / heat called sunlight -> the heat from the sunlight cause ice to melt