Question

Igneous Rocks are classified based upon their
a. Mineralogy and composition
b. Crystal texture and density
c. Crystal size and mineral composition
d. Hardness and Texture

Answer 1

Which do you think? Anything you can eliminate?

Answer 2

Umm no idea

Answer 3

OK, so lets take three Igneous Rocks from here:
http://geology.com/rocks/igneous-rocks.shtml

I am looing at diorite, granite and rhyolite.

Diorite is a coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende and sometimes quartz.

Granite is a coarse-grained, light colored, intrusive igneous rock that contains mainly quartz and feldspar minerals.

Rhyolite is a light-colored, fine-grained, extrusive igneous rock that typically contains quartz and feldspar minerals.

Two of those are intrusive and one is extrusive.

Notice what is similar and different between the diorite and granite? Those are both intrusive. But how are they different making them different rocks? How are they similar, making them intrusive?

Now granite and rhyolite. Notice there is only one thing different between them, but they are still seen as different rocks?

Answer 4

i have the answer i think that it is d

Answer 5

CG: No.

Answer 6

A

Answer 7

The mineralogy is the composition, so no.

Interesting that all these people are guessing when the OP has not come back. Anyhow, all the information you need is right in the examples I gave.

Answer 8

umm is it C

Answer 9

Yep.