Dynamic Planet B/C

Test your knowledge of various Science Olympiad events.
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Dynamic Planet B/C

Postby Tailsfan101 » September 5th, 2017, 3:26 pm

Welcome to the 2018 Dynamic Planet B/C Question Marathon!

On average, how thick is oceanic crust?
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Re: Dynamic Planet B/C

Postby Sully0413 » September 6th, 2017, 4:01 am

On average, how thick is oceanic crust?

Answer
Around 100 km


Thanks Appleshake123!
Last edited by Sully0413 on September 6th, 2017, 7:22 am, edited 2 times in total.

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Re: Dynamic Planet B/C

Postby appleshake123 » September 6th, 2017, 4:27 am

Sully0413 wrote:I don't know how to do the white box thing because when I spoiler it it just blacks out. Sorry :oops:


It's the Hide function. Use it like

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Re: Dynamic Planet B/C

Postby Tailsfan101 » September 6th, 2017, 8:44 am

Sully0413 wrote:
On average, how thick is oceanic crust?

Answer
Around 100 km


Thanks Appleshake123!

Correct answer
4 km (6 mi)

You may now pose a question.
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Re: Dynamic Planet B/C

Postby Sully0413 » September 6th, 2017, 8:52 am

Oh. I read that as oceanic lithosphere. That's embarrassing. :oops:

Question
Name and describe three ways that magma's composition can be changed

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Re: Dynamic Planet B/C

Postby OrigamiPlanet » September 9th, 2017, 9:44 pm

Sully0413 wrote:Oh. I read that as oceanic lithosphere. That's embarrassing. :oops:

Question
Name and describe three ways that magma's composition can be changed


Answer
Two different magmas combine into one, trace elements hidden within rocks that have melted to lava, and partial melting that varies by degree... right?
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Re: Dynamic Planet B/C

Postby OrigamiPlanet » November 29th, 2017, 7:57 pm

I'll try to bring this one back up again with some questions.

1) Define slab pull
2) In partial melting, ______ and ______ crust are involved in a ________ plate bondary. Fill in the blanks, the first two are asking what types of plates, like continental and continental.
3) Give two pieces of evidence to Wegener's theory.
4) A follow up to 3, name his theory and explain why it was initially rejected.
5) Which of the following are the first and second most common rock in oceanic crust? List both letters in the order of most common rock first, then second most common rock second.
a) Diorite
b) Basalt
c) Shale
d) Breccia
e) Granite
f) Not listed above
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Re: Dynamic Planet B/C

Postby Knyte_Xjn » December 31st, 2017, 2:34 pm

OrigamiPlanet wrote:I'll try to bring this one back up again with some questions.

1) Define slab pull
2) In partial melting, ______ and ______ crust are involved in a ________ plate bondary. Fill in the blanks, the first two are asking what types of plates, like continental and continental.
3) Give two pieces of evidence to Wegener's theory.
4) A follow up to 3, name his theory and explain why it was initially rejected.
5) Which of the following are the first and second most common rock in oceanic crust? List both letters in the order of most common rock first, then second most common rock second.
a) Diorite
b) Basalt
c) Shale
d) Breccia
e) Granite
f) Not listed above



Answers
1) Slab pull- force caused by the sinking of lithosphere into asthenosphere at destructive margin; hypothesized to be one of the two major driving forces for the movement of plates
2) oceanic, oceanic, divergent
3) 1. fossils of the same species found across different continents, but the species are known to have been incapable of travelling that far 2. continents appear to fit together
4) Theory of Plate Tectonics; lacking proof
5) b. , c.
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Re: Dynamic Planet B/C

Postby OrigamiPlanet » January 1st, 2018, 1:38 pm

Knyte_Xjn wrote:
OrigamiPlanet wrote:I'll try to bring this one back up again with some questions.

1) Define slab pull
2) In partial melting, ______ and ______ crust are involved in a ________ plate bondary. Fill in the blanks, the first two are asking what types of plates, like continental and continental.
3) Give two pieces of evidence to Wegener's theory.
4) A follow up to 3, name his theory and explain why it was initially rejected.
5) Which of the following are the first and second most common rock in oceanic crust? List both letters in the order of most common rock first, then second most common rock second.
a) Diorite
b) Basalt
c) Shale
d) Breccia
e) Granite
f) Not listed above



Answers
1) Slab pull- force caused by the sinking of lithosphere into asthenosphere at destructive margin; hypothesized to be one of the two major driving forces for the movement of plates
2) oceanic, oceanic, divergent
3) 1. fossils of the same species found across different continents, but the species are known to have been incapable of travelling that far 2. continents appear to fit together
4) Theory of Plate Tectonics; lacking proof
5) b. , c.


For 5, the second one isn't listed, it should be gabbro, but everything else looks right!
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Re: Dynamic Planet B/C

Postby OrigamiPlanet » January 11th, 2018, 1:19 pm

Knyte_Xjn, are you there? It's your turn.
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Re: Dynamic Planet B/C

Postby Sleepy » January 20th, 2018, 6:26 pm

I suppose I'll bring this back.

Q: Contrast the Airy Model vs. Pratt Model when dealing with isostasy.
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Re: Dynamic Planet B/C

Postby knottingpurple » January 21st, 2018, 8:56 am

Sleepy wrote:
Q: Contrast the Airy Model vs. Pratt Model when dealing with isostasy.


Answer
The Airy Model of isostasy assumes that the earth's crust has constant density while the Pratt Model of isostasy allows for different densities of crust - as a result, the Airy Model assumes that different heights of surface crustal features are compensated with a deeper extent of the crust into the mantle, while the Pratt Model assumes that the extent of the crust into the mantle everywhere is equal because the differing weights of the crust are compensated by the different densities of the crust.
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Re: Dynamic Planet B/C

Postby Sleepy » January 21st, 2018, 5:28 pm

knottingpurple wrote:
Sleepy wrote:
Q: Contrast the Airy Model vs. Pratt Model when dealing with isostasy.


Answer
The Airy Model of isostasy assumes that the earth's crust has constant density while the Pratt Model of isostasy allows for different densities of crust - as a result, the Airy Model assumes that different heights of surface crustal features are compensated with a deeper extent of the crust into the mantle, while the Pratt Model assumes that the extent of the crust into the mantle everywhere is equal because the differing weights of the crust are compensated by the different densities of the crust.

Correct!
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Re: Dynamic Planet B/C

Postby knottingpurple » January 30th, 2018, 3:11 pm

Aight so I guess I'm supposed to put a question again...

Define obduction and provide one example of a situation in which it has occurred or is occurring.
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Re: Dynamic Planet B/C

Postby OrigamiPlanet » February 2nd, 2018, 12:40 pm

knottingpurple wrote:Aight so I guess I'm supposed to put a question again...

Define obduction and provide one example of a situation in which it has occurred or is occurring.


Obduction is a concept similar to subduction, only oceanic crust goes over the continental crust at a convergent plate boundary. One example of this is New Caledonia.
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