What are the 2 layers of continental crust called?

Mgo2 is the oxidation state of manganese oxide

Answer) by studying proton collisions hope this : )

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.