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www.reference.com/article/many-types-rocks-39a9fbe281d153ea

There are three basic rock types that make up the geology of the Earth. They are igneous rocks, sedimentary rocks and metamorphic rocks. The rock type is defined by the way the rocks were created.

www.reference.com/article/rock-3853a60339879788

Dwayne Johnson, nicknamed "The Rock," is a Hollywood film star and a former professional wrestler for World Wrestling Federation. Some of his movies include, "The Mummy Returns," "The Scorpion King" and "The Fast and the Furious" series.

www.reference.com/science/rocks-important-9b01db3aa22feb9c

Rocks are important because geologists use evidence from them to learn about what the Earth was like in the past. They allow scientists to build a historical record of the planet to learn what events occurred before people lived.

www.reference.com/article/different-types-rocks-368741456499e927

Rocks are categorized into three types: igneous, sedimentary and metamorphic. They are mainly classified based on the processes they undergo during formation.

www.reference.com/article/rocks-form-41968391ef40c5ab

Rocks are formed in three primary ways, and each method produces rocks with different characteristics. Rocks are either classified as sedimentary, igneous or metamorphic, depending on the manner in which they were formed. Most rocks encountered in everyday life are sedimentary, although some igneous

www.reference.com/article/three-types-rocks-5913adb1025b0bf0

The three classes of rocks are sedimentary, metamorphic and igneous. The most significant differences found among these the three types have to do with how the rock is formed.

www.reference.com/article/different-types-rocks-formed-14cad6a9ac4202d4

Sedimentary rocks are formed from sediment that is accumulated and compacted over time, while metamorphic rocks are the result of heat and pressure deep within the Earth's surface. Igneous rocks are created when magma reaches the surface and then cools and hardens.

www.reference.com/article/rocks-color-395e2e2c45f5c3c7

Rocks primarily derive their color from their constituent minerals. Rocks rich in feldspar and quartz are usually light in color, whereas those that have a lot of pyroxenes, olivines or amphiboles are dark in color. However, the size of the particles that make up the rock can affect the color as wel

www.reference.com/article/rock-black-81960e2046a94b00

Dwayne "The Rock" Johnson is of mixed Samoan and African-Canadian descent. Johnson was born in Hayward, CA, on May 2, 1972. Between 1996 and 2004, Johnson was active as a wrestler in the World Wrestling Federation and became well known under his ring name, "The Rock."

www.reference.com/science/study-rocks-called-a941d3f14566b696

The study of rocks is known as geology. Scientists who study rocks are known as geologists. There are several subdivisions of geology, with different designations for researchers who study the individual disciplines.