Dynamic Planet B/C

[Tailsfan101]

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

On average, how thick is oceanic crust?

[Sully0413]

On average, how thick is oceanic crust?

Answer

Around 100 km

Thanks Appleshake123!

[appleshake123]

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

It's the Hide function. Use it like

Code: Select all

[hide] bolded title | hidden stuff [/hide]

bolded title

hidden stuff

[Tailsfan101]

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.

[Sully0413]

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

Question

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

[OrigamiPlanet]

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

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?

[OrigamiPlanet]

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

[Knyte_Xjn]

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.

[OrigamiPlanet]

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!

[OrigamiPlanet]

Knyte_Xjn, are you there? It's your turn.

[Sleepy]

I suppose I'll bring this back.

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

[knottingpurple]

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.

[Sleepy]

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!

[knottingpurple]

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.

[OrigamiPlanet]

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.