At first this seems like an easy question. We see rocks every day. Each rock is like reading a story. By studying them we can learn about how the earth's crust is formed.
Some rocks are shiny, some are flat and dull, others are very compact.
Analyzing these differences can help us understand how they were formed. We can also use the characteristics of rocks to classify them. Visit the Utah State 8th Grade Integrated Science Core Curriculum Page . USOE Home Page Copyright by the Utah State Office of Education.