## Dynamic Planet B/C

BennyTheJett
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### Re: Dynamic Planet B/C

Sharan.thiru wrote:
WangwithaTang wrote:
BennyTheJett wrote:
Density times thickness equals density times thickness. That's why different topographies can be equal in weight. The image is more detailed. you take the density times thickness of the crust, and it equals the density times thickness of this other crust. If they are equal there is equilibrium. If unequal, there is depression or rebound.

Ok, so how do you solve the problem posed by this image?

You do realize that most of the math on the test is about glacial movement, erosion, and mass balance right. THere's not much you can do with isostasy when it comes to glaciers.

There's not much on it, but it appears on many many tests.
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WangwithaTang
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### Re: Dynamic Planet B/C

BennyTheJett wrote:
WangwithaTang wrote:
BennyTheJett wrote:
Density times thickness equals density times thickness. That's why different topographies can be equal in weight. The image is more detailed. you take the density times thickness of the crust, and it equals the density times thickness of this other crust. If they are equal there is equilibrium. If unequal, there is depression or rebound.

Ok, so how do you solve the problem posed by this image?

All the yellow (crust) must have an equal density times thickness for there to be isostatic equilibrium. If the numbers aren't equal the smaller number is sinking (I think).

Thank you! Can somebody explain the difference between hanging valleys, truncated spurs, and U-shaped Valleys are? Sorry for all the question guys I'm new to dynamic planet.

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### Re: Dynamic Planet B/C

WangwithaTang wrote:
BennyTheJett wrote:
WangwithaTang wrote:Ok, so how do you solve the problem posed by this image?

All the yellow (crust) must have an equal density times thickness for there to be isostatic equilibrium. If the numbers aren't equal the smaller number is sinking (I think).

Thank you! Can somebody explain the difference between hanging valleys, truncated spurs, and U-shaped Valleys are? Sorry for all the question guys I'm new to dynamic planet.

Have you looked at pictures? I find that visuals really help me with all the glacial features.

Sharan.thiru
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### Re: Dynamic Planet B/C

pb5754[] wrote:
UTF-8 U+6211 U+662F wrote:
Sharan.thiru wrote:THere's not much you can do with isostasy when it comes to glaciers.

This is false, the melting and formation of large glaciers cause the Earth's lithosphere to rebound and move down, respectively.

Yep, I've seen isostasy questions at almost every competition I've gone to.

That’s weird since I’ve never seen isostasy problems at any competitor ion. Oof.
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EastStroudsburg13
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### Re: Dynamic Planet B/C

Sharan.thiru wrote:
pb5754[] wrote:
UTF-8 U+6211 U+662F wrote:This is false, the melting and formation of large glaciers cause the Earth's lithosphere to rebound and move down, respectively.

Yep, I've seen isostasy questions at almost every competition I've gone to.

That’s weird since I’ve never seen isostasy problems at any competitor ion. Oof.

It may help to consider that Division B and Division C tests likely focus on different aspects of the event.
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### Re: Dynamic Planet B/C

EastStroudsburg13 wrote:
Sharan.thiru wrote:
pb5754[] wrote:Yep, I've seen isostasy questions at almost every competition I've gone to.

That’s weird since I’ve never seen isostasy problems at any competitor ion. Oof.

It may help to consider that Division B and Division C tests likely focus on different aspects of the event.

I recall seeing isostasy on division B tests last year though (although it was a different topic), but I suppose it's reasonable to say that division B tests would have less about it.

BennyTheJett
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### Re: Dynamic Planet B/C

WangwithaTang wrote:
BennyTheJett wrote:
WangwithaTang wrote:Ok, so how do you solve the problem posed by this image?

All the yellow (crust) must have an equal density times thickness for there to be isostatic equilibrium. If the numbers aren't equal the smaller number is sinking (I think).

Thank you! Can somebody explain the difference between hanging valleys, truncated spurs, and U-shaped Valleys are? Sorry for all the question guys I'm new to dynamic planet.

http://officersiasacademy.blogspot.com/2016/04/landforms-created-by-glacier.html Check this out. This has good pictures. It doesn't include truncated spurs. Google that and you'll see what it is. Images are critical for glacial features. U shaped valleys are the shape of the valley that a glacier carves. The other major type of valley is a V shaped valley, which is carved by a stream or river.
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WangwithaTang
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### Re: Dynamic Planet B/C

Ok, so how exactly does a hanging valley form? I know there's something about how the glacial valley makes the valley steeper? But how does that create another valley?

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### Re: Dynamic Planet B/C

WangwithaTang wrote:Ok, so how exactly does a hanging valley form? I know there's something about how the glacial valley makes the valley steeper? But how does that create another valley?

A hanging valley is caused when a tributary glacier flows into a bigger (and lower) glacier. The tributary glacier erodes a smaller hanging valley above the valley of the bigger glacier.

WangwithaTang
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### Re: Dynamic Planet B/C

UTF-8 U+6211 U+662F wrote:
WangwithaTang wrote:Ok, so how exactly does a hanging valley form? I know there's something about how the glacial valley makes the valley steeper? But how does that create another valley?

A hanging valley is caused when a tributary glacier flows into a bigger (and lower) glacier. The tributary glacier erodes a smaller hanging valley above the valley of the bigger glacier.

oh, okay, thanks!

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### Re: Dynamic Planet B/C

States is Saturday and I am freaking out.
I don´t know any of the material so guess I´m gonna wing it
Even psychos Science Olympiad competitors have standards.

BennyTheJett
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### Re: Dynamic Planet B/C

raytay wrote:States is Saturday and I am freaking out.
I don´t know any of the material so guess I´m gonna wing it

DONT WING IT:

Take notes on all the things on the rule page at least.
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UTF-8 U+6211 U+662F
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### Re: Dynamic Planet B/C

BennyTheJett wrote:
raytay wrote:States is Saturday and I am freaking out.
I don´t know any of the material so guess I´m gonna wing it

DONT WING IT:

Take notes on all the things on the rule page at least.

I would suggest knowing at least what a glacier is and what the different types of glaciers and glacier formations look like. Mass balance also isn't very hard to figure out.

raytay
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### Re: Dynamic Planet B/C

UTF-8 U+6211 U+662F wrote:
BennyTheJett wrote:
raytay wrote:States is Saturday and I am freaking out.
I don´t know any of the material so guess I´m gonna wing it

DONT WING IT:

Take notes on all the things on the rule page at least.

I would suggest knowing at least what a glacier is and what the different types of glaciers and glacier formations look like. Mass balance also isn't very hard to figure out.

okay great! Thanks so much!
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JoeyC
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### Re: Dynamic Planet B/C

Just look over all of wikipedia's pages on glaciers. Helps alot for the basics. If you have extra time look into glacial ages, when they happened, and their causes.
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