Butter melt when you heat it in a pan on the stove. is this a chemical change or physical change? how can you tell?

Which of these will change if the air in aclosed bottle is heated? abcdthe mass of the airthe composition of the airthe air pressure in the bottlethe number of air molecules in the bottle

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Match the mixture with the substance// i really need on this guys (it’s a pic btw)