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en.wikipedia.org/wiki/List_of_rock_types

The following is a list of rock types recognized by petrologists. There is no agreed number of specific types of rocks. Any unique combination of chemical ...

www.learner.org/interactives/rockcycle/types.html

Types of Rocks. Rocks are not all the same! The three main types, or classes, of rock are sedimentary, metamorphic, and igneous and the differences among ...

geology.com/rocks

Photographs and information for a large collection of igneous, metamorphic and sedimentary rocks. Geology.com.

jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry13.html

Just as any person can be put into one of two main categories of human being, all rocks can be put into one of three fundamentally different types of rocks.

www.zmescience.com/other/science-abc/types-of-rock

Jun 27, 2017 ... The three main types of geological rocks are described. They are...

www.slideshare.net/mariejajaroa/kinds-of-rocks-57597810

Jan 28, 2016 ... Science Grade V: Three Kinds of Rocks - Igneous rock - Sedimentary Rock - Metamorphic Rock.

www.ask.com/youtube?q=Kinds+of+Rocks&v=17l2LrjZi9o
Aug 10, 2015 ... 3 Types of Rocks. On the bases of their formation, rocks are broadly divided into three types, namely igneous rocks, sedimentary rocks and ...

quatr.us/geology/different-kinds-rocks.htm

Jun 26, 2017 ... There are three different kinds of rocks on Earth, and they form in very different ways. The first kind is igneous rock, which means “fire rocks”.

en.wikibooks.org/wiki/Identifying_Rocks_and_Minerals/Types_of_Rocks

There are three different types of rocks: Igneous, Sedimentary, and Metamorphic. The difference between each type is in how they are formed.