Fill in the Blanks Rocks.Online version Guess the missing words. by Raquel Serrano Barrueta 1 minerals igneous nonliving Geology geologists 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 .