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

now i think its b 
my reasourceses
The reason the three way classification of Igneous, Sedimentary and Metamorphic is used is because the processes involved in forming the three rock types usually results in a characteristic relationship between the mineral grains that is diagnostic.

anonymous · Answer

@rose18920 you gave me the wrong answer haha
it was 'how they formed', but it's okay :D

anonymous · Answer

o sorry thanks for forgiving me

anonymous · Answer

i gave you a medal to make up for it:)