A mining company is interested in monazite, a mineral substance that forms in igneous rock in Earth's interior. They think they found a lot of monazite in a sedimentary rock formation at Earth's surface. Could this really be monazite? If so, how could the monazite have become part of sedimentary rock?

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

it's 3.2 on edge, i just took the test.