Dynamic Planet B/C

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Unome
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Dynamic Planet B/C

Postby Unome » September 6th, 2016, 10:25 am

Figured I might as well start this. For those who don't already know, this year's topic is Tectonics.
First question(s)
1. What are the layers of the ophiolite suite? 2. If an ophiolite is found near a coastline, what tectonic processes is this indicative of?
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Re: Dynamic Planet B/C

Postby bhavjain » September 6th, 2016, 8:38 pm

Figured I might as well start this. For those who don't already know, this year's topic is Tectonics.
First question(s)
1. What are the layers of the ophiolite suite? 2. If an ophiolite is found near a coastline, what tectonic processes is this indicative of?
Answer
1. From least deep to most deep: sediments, pillow lava (basalt), sheeted dykes, gabbro, and peridotite. 2. Obduction at a convergent plate boundary.
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Re: Dynamic Planet B/C

Postby Unome » September 7th, 2016, 6:25 am

Correct, your turn!
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Re: Dynamic Planet B/C

Postby bhavjain » September 7th, 2016, 8:24 am

What is the smallest tectonic plate? Biggest? (Must be major or minor plates)
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Re: Dynamic Planet B/C

Postby chscioly » September 9th, 2016, 9:11 am

Answer
Smallest plate-Scotia Plate Largest plate-Pacific Plate I haven't been able to find a clear definition of major and minor plates. It seems like different sources are defining them based on different area requirements.

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Re: Dynamic Planet B/C

Postby Unome » September 9th, 2016, 9:23 am

Answer
Smallest plate-Scotia Plate Largest plate-Pacific Plate I haven't been able to find a clear definition of major and minor plates. It seems like different sources are defining them based on different area requirements.
I've found the same thing. Generally I rely on definitions provided on websites for college courses or in commonly-used textbooks, as that is what event supervisors tend to use.
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Re: Dynamic Planet B/C

Postby bhavjain » September 9th, 2016, 12:02 pm

Answer
Smallest plate-Scotia Plate Largest plate-Pacific Plate I haven't been able to find a clear definition of major and minor plates. It seems like different sources are defining them based on different area requirements.
Correct. Wikipedia lists two more smaller minor plates, but all my other sources list Scotia as the smallest microplate.
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Re: Dynamic Planet B/C

Postby chscioly » September 10th, 2016, 10:42 am

Question
Give three pieces of evidence supporting continental drift.

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Re: Dynamic Planet B/C

Postby Unome » September 10th, 2016, 10:54 am

Answers
1. The presence of similarly layered/formed rock formations on many southern continents (iirc the Karoo supergroup is a major example). 2. Magnetic polarity changes in older rocks, especially those that have rotated due to continental drift, or those that have been reversed along seafloor spreading axes. 3. The abundance of similar fossil flora and fauna on many southern continents that presumably could not have crossed the oceans, implying that there once existed a land-based connection between the continents.
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Re: Dynamic Planet B/C

Postby chscioly » September 10th, 2016, 12:57 pm

Correct, your turn!

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Re: Dynamic Planet B/C

Postby Unome » September 12th, 2016, 8:05 am

Question
Explain the process by which a subducting oceanic plate forms a chain of felsic volcanoes.
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Re: Dynamic Planet B/C

Postby deji725 » October 14th, 2016, 7:18 pm

Answer, i guess?
When the overriding plate in a subduction zone is a continental plate, the magmas have to rise through continental crust to reach the surface. In this process, rising mafic magmas often incorporate some continental crust through assimilation. Therefore Magma formed above a subducting plate slowly rise into the overriding crust and finally to the surface forming a volcanic arc.Beneath the volcanic arc intrusive igneous rocks formed from magma that didn't make it all the way to the surface before crystallizing.

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Re: Dynamic Planet B/C

Postby freed2003 » January 10th, 2017, 9:49 pm

Why do mountain ranges have stronger gravity then valleys?
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Re: Dynamic Planet B/C

Postby Unome » January 11th, 2017, 5:08 am

Why do mountain ranges have stronger gravity then valleys?
I'm pretty sure they don't...
Since force is proportional to mass but inversely proportional to the square of distance, even if the intervening space when being lifted up is completely filled and as dense as the rest of the Earth (neither of which is the case with mountains) the gravitational force would still be lower than at a lower altitude because the distance term in the gravitational equation will overwhelm the mass term.
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Re: Dynamic Planet B/C

Postby freed2003 » January 11th, 2017, 7:12 am

Correct, I got trolled by this question one time
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