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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/article/make-hard-rock-candy-fe772a4e26241055

To make hard rock candy, mix water and sugar and heat the mixture until it reaches hard-crack stage at 300 degrees. Once it does so, remove from heat, add flavoring, pour the mixture into a lined pan and let it cool.

www.reference.com/article/rock-hard-abs-4153fd3ce96a79a7

To getting rock-hard abs, you must lower your body fat percentage and develop your abdominal muscles. Eat a diet high in protein and fiber, do cardiovascular exercises regularly and train your abs a few days each week to get a hard stomach.

www.reference.com/science/importance-rocks-9a044a2b814aa1ae

Rocks have a broad range of uses that makes them significantly important to human life. For instance, rocks are used in construction, for manufacturing substances and making medicine and for the production of gas. Rocks are also extremely vital to scientists as they provide clues about the Earth’s h

www.reference.com/article/methods-testing-metal-hardness-7f201319634a9bcf

Scratch, rebound and indentation hardness testing methods are the three main ways to determine how resistant metals are to outside forces that may permanently alter their shapes. Testing processes such as the Knoop, Vickers or Rockwell Hardness test utilize the same basic physical principles to prod

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/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/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/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/article/rock-band-f4489c734dc80202

A rock band is a group of musicians who play rock music together. Rock is an extremely diverse genre, encompassing a range of styles and sounds, but it is typically based around guitars, bass, drums and vocals.