Which will heat up fast, metal or cotton?

Metal heats fast but cotton combusts at a low temperature it would depend on the amount and conditions of each.

Explanation:

equal amounts metal will heat faster

more cotton metal will heat faster

less enough amount of cotton, cotton will combust and therefore it will have heated faster in that case.

metal is a great conducter of heat and cotton is just very flammable

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.