Introduction To Geology quiz

Here's the wiki picture of "Various granites":

Some granites are light in color. Just because some others are dark doesn't make that a false statement.Apples are red.The existence of green apples doesn't make that statement false.

Nah, I don't think the all is implied. If you wanted to say that, then you'd need to include the all as: All apples are red.I mean, cars are red. Cars are white. Cars are black. None of those statements are false.As it sits, if you claim the statement "apples are red" is false, then what you are saying is that apples are not red, and that's just wrong, cause some of them are. Not meaningless... ambiguous.

It seems like splitting hairs to me (granted this is about a Geology quiz so its warranted)Is it just the particular mineral compositions that make one intrusive igneous rock deserving of the name, but another intrusive igneous rock not?

George, because gabbro sounds silly and diorite at least sounds like rock.

I was asking out of ignorance to see if there was anything more to it than that. For example, when classifying metals you can have two differnt types of steel even though they have the same composition. Martensite is quenched austenite which results in a different crystalline structure of the same composition. For polymers, HDPE is still just polyethylene but its heavily cross linked and has a much higher density. So you could use properties of the material in addition to its composition. Density... hardness... crystalline structure... melting temp... Color... Aesthetics... usefulness as a counter-top. I didn't know if any other things were taken into account or not.Apparently the answer is "no".