Rocks and the Rock Cycle: What Is a Rock?

The video tutorial explains that rocks are made of one or more minerals, with most rocks containing multiple types. Granite, a common building stone, is composed of minerals like feldspar, quartz, mica, and hornblende. Rocks are classified into three main groups based on their formation: igneous, sedimentary, and metamorphic. The video provides an introduction to these rock types, starting with igneous rocks.

How can rocks be classified?

What are the three main groups of rocks?