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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sat Sep 04, 2010 7:46 am 
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a. No, granite is.

b. Yes, indeed. The difference between basalt and gabbro is that basalt is a fine-grained rock while gabbro is a coarse-grained rock.

c. Yes. It has a uniform grey colour.

d. Yes. The surface of Mars appears to be composed primarily of basalt.

e. Yes. The commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene.

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Sep 05, 2010 12:40 am 
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1. F - it is medium-grained or fine-grained
2. T - yes, itself and gabbro are often classified together because of this.
3. F - Fresh basalt is black or dark grey.
4. T - Olympus Mons is a basaltic shield volcano
5. T - particularly interesting on the tops of lava flows as it is highly vesiculated

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Wed Sep 08, 2010 9:25 pm 
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:wall: :wall: This quiz came to a standstill. :huh:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Sep 09, 2010 10:05 am 
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onewithnature wrote:
Which statements are TRUE regarding BASALT:

a. Basalt is a coarse-grained rock.
b. Basalt has a composition similar to gabbro.
c. Basalt is usually pale-grey in colour.
d. The Olympus Mons volcano on the planet Mars is composed of Basalt.
e. Basalt is produced mostly from lava flows?


:redface: Apologies for the delay ...

a. FALSE. Basalt is a fine-grained rock.
b. TRUE. Basalt and Gabbro have similar chemical compositions.
c. FALSE. Although it can sometimes be pale grey, it is usually dark-grey to black.
d. TRUE.
e. TRUE. It is formed from rapidly cooling lava flows on the surface of the earth.

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Sep 09, 2010 10:08 am 
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ET, 4/5 ... thanks for trying. :thumbs_up: :clap:

Tom, 5/5 ... You're IT. :thumbs_up: :clap: :clap:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Sep 09, 2010 11:33 pm 
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Thanks OWN, I certainly had to broaden my horizons to answer that one.

Put these rock types into order from most common to least common in SA:

Igneous
Metamorphic
Sedimentary

Easy for some....

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Fri Sep 10, 2010 5:44 am 
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Tom :clap: :clap: :clap:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Fri Sep 10, 2010 8:21 am 
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S, I, M?

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Fri Sep 10, 2010 8:25 am 
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I, S, M.


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Sep 12, 2010 5:44 pm 
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No-ones got it quite yet...

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Sep 12, 2010 6:01 pm 
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:hmz:

Okay, got to be S, M , I.

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Sep 12, 2010 6:12 pm 
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:thumbs_up: OWN, you're IT!!

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Sep 12, 2010 6:14 pm 
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That's what research does in place of guesswork! :wink:

BBL with a Q. :thumbs_up:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Fri Sep 24, 2010 1:51 pm 
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What is the most prized mineral that originates in the Earth's mantle?

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Mon Sep 27, 2010 11:59 pm 
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Taking a wild guess OWN but I'll go with Diamonds!?


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