Compléter Rocks.Version en ligne Guess the missing words. par Raquel Serrano Barrueta 1 nonliving geologists minerals igneous Geology is the study of the things that the Earth is made of . Rocks and are nonliving things in the Earth . People who study geology are called . Rocks are clusters of minerals and other inorganic materials . There are three main types of rocks : rocks , sedimentary rocks and metamorphic rocks .