Why is the electrolysis of water classified as a chemical change but the freezing of water is not

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

Which process transfers heat from inside earth to its surface? convection currents in mantle pulling away of tectonic plates drawing in of tectonic plates convection currents in crust

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.