Mineral Resources
The greatest practical value of geology lies in locating, mapping, and exploiting the economic resources of Earth. These resources...


Sedimentary Rocks
Sedimentary rocks cover 80 percent of Earth’s exposed surface and contain nearly all of our record of past life, past environments, and...


Rock Types
There are three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks are rocks that have cooled (frozen or...


The Rock Cycle
Three kinds of rocks will be covered in more detail in later lessons and chapters in your textbook. They are: Igneous rocks (literally,...






