 The three main rock classifications are Igneous, Sedimentary, and Metamorphic. Rocks are classified into these groups by the way they were formed.
Rocks that formed from magma are called igneous rocks. Igneous comes from the Latin word ignis which means "fire". Rocks that are formed from heat and pressure are called metamorphic rocks. Rocks that are formed from the cementing together of small pieces of rocks or shells are called sedimentary rocks. We will discuss these three types of rocks more in depth later in this chapter.
Click on the "Next" button to see a map of the surface rocks of the United States.
|
Back
Beginning
Questions
Next
To VolcanoWorld