please help me with passage.

OA will be given later.

1-b
2-e
3-e
4-c
_________________

Best Regards,

Paul

1 - D

2 - A

3 - C

4 - C

(1)The primary purpose of the passage is to
A. discuss an objection to Gurney’s theories about the uses of indicator minerals
Definitely not
B. explore the formation of diamonds and the reasons for their scarcity
yes, but not the main purpose
C. analyze the importance of kimberlite pipes in the formation of diamonds
Again not the main purpose
D. define the characteristics of indicator minerals under differing conditions
Yes he did that, but still it's not the purpose
E. explain a method of determining whether kimberlite pipes are likely to contain diamonds
Yes


(2)Each of the following is mentioned in the passage as a difference between G10 garnet and other versions of garnet EXCEPT
A. level of oxidation
This is mentioned for the ilmenites, instead of the garnet
B. commonness of occurrence
C. chemical signature
D. place of formation
E. appearance in conjunction with diamonds

(3)
The passage suggests that the presence of G10 garnet in a kimberlite pipe indicates that
A. the pipe in which the garnet is found has a 90% chance of containing diamonds
No number is mentioned
B. the levels of calcium and chrome in the pipe are conducive to diamond formation
C. the pipe passed through a diamond-stability field and thus may contain diamonds
D. any diamonds the pipe contains would not have come from the diamond-stability field
Definitely out
E. the pipe’s temperature was so high that it oxidized any diamonds the pipe might have contained
oxidization is not mentioned when talk about garnet

(4)
According to the passage, Gurney refined the use of ilmenites in prospecting for diamonds in which of the following ways?
A. He found that ilmenites are brought up from the mantle by kimberlite pipes and erode out into the surrounding land in greater quantities than diamonds.
Not helping
B. He found that since ilmenites do not form in the diamond-stability field, their presence indicates the absence of diamonds.
Not all ilmenites, but the ones with highly oxidized iron
C. He showed that highly oxidized iron content in ilmenites indicates a low survival rate for diamonds.
Thus this one is correct
D. He found that when the iron in ilmenites is highly oxidized, conditions in the magma were probably conducive to the formation of diamonds.
It's the opposite
E. He showed that ilmenites take on more or less oxygen in the kimberlite pipe depending on the concentration of diamonds.
What are you talking about

Thank you! I haven't even prepared anything for RC and CR. Was counting on my basic skills.

Thanks Paul.

Now I have is only pdf file.

If I have, I will share with you.

But your grammar skills still PWNs everyone of us. (Yes you can see that I've been wandering around teh internet. ) And I can hardly get about half of the grammar questions right. So there. And we share our best tricks so we can collectively PWN the GMAT.

710 speaks for itself.

"G10 garnets, a type of garnet typically found in diamond-rich pipes"
Meaning garnets appear in conjunction with diamonds.


Hmm I don't know how to talk about this. Basically we can shorten the paragraph like this:

Diamonds are very important. Because of the way they are formed we can use some other things to locate diamonds. But it is still hard to locate them. This person, however, discovered a couple neat ways so that it isn't so hard to find diamonds now.

So what is the purpose of this paragraph? It talks about diamonds, yes, but not everything about diamond. It's about how to find them. And more specifically, the method that makes it easy to find them.