ALERT Learn More | NASP Certification Program: The Path to Success Has Many Routes. Choose Yours


Last updated: February 12, 2017

What Does Rock Mean?

Rock is a solid material made from minerals, which forms part of the earth's surface and lies under soil or extends out from it. Rock has various forms of composition and has three primary means of formation that result in three main, different types of rock. The three types of rock are igneous, metamorphic and sedimentary, which are all created under different conditions.

Safeopedia Explains Rock

Igneous rock is formed when lava or magma cools and solidifies. It may crystallize in this process. Metamorphic rock is formed as a sedimentary or igneous rock is subject to chemical alteration by heat and pressure and is compressed to a denser form. Sedimentary rock is formed when other types or rock are broken down into particles by wind, ice, water flow etc and are deposited together, solidified or cemented into one solid mass.


Share this Term

  • Facebook
  • LinkedIn
  • Twitter

Related Reading


Industrial Hygiene

Trending Articles

Go back to top