Oplemichell53go Oplemichell53go Science Answered true or false74. Formation of magma generally begins in the center of a rock body.75. A mineral is a naturally occurring, inorganic, solid material that has a fixed crystal structure and a definitechemical composition.76. Minerals themselves are made up of one or a number of chemical elements.77. All rocks are made of one or more minerals78. Diamond is the hardest mineral.79. As you go deeper into the earth's crust its temperature becomes colder.