The three types of rocks are classified by?

color
grain size
chemical composition
how they formed

Question

The three types of rocks are classified by?

color
grain size
chemical composition
how they formed

anonymous · Answer

grain size, chemical composition, and how they formed

anonymous · Answer

I can't pick all of them lol.

turingtest · Answer

how they formed: igneous, sedementary, and some other I forget

anonymous · Answer

metamorphic

anonymous · Answer

I didn't pick pick all of them. Rocks are classified by their grain size, their chemical composition and how they are formed. http://en.wikipedia.org/wiki/Rock_%28geology%29#Rock_classification. The only one that is not used to classify rocks is colour, since colour is merely a by product of the other three.

turingtest · Answer

@ JonnyMcA
I guess you're right, but if you have to pick just one then would you not agree with "how they were formed" as the best answer?

anonymous · Answer

If push came to shove, and you could only choose one, then it would have to be the most important and that is how they formed