Dynamic Planet B/C

[Nerd95]

Thank you pettywap and knottingpurple! I admittedly have been stalking the DP forums hahah what fun (read: I'm crying) and noticed someone else posted a question similar to mine. Seeing how no one responded, I was hopping if I prodded some more, a knowledgeable one would enlighten us all. Is there a specific time frame I should focus on for that topic (like mesozoic etc)? Also I have searched for ocean currents before but can't find any info on prehistoric currents and change over time...

(Thank you once again!!)

Also, re ocean currents: You're not going to find much about Proterozoic ocean currents. The records for ocean currents are often stored in sedimentary layers, and it's pretty rare that we'll have any undeformed sedimentary layers from a very long time ago, just given the way plate tectonics works.

The study of old oceans and climate relies heavily on isotopes (like carbon and oxygen), which is out of scope for this event but super interesting if you're interested!

[Celiepk]

Does anyone know if we will need to make formulas with isostasy to calculate density/weight etc of continental crusts or anything of the sort? also, if anyone has info on "f. Continental drift's role on opening and closure of ocean gateways and land-bridges, with specific reference to ocean circulation changes, climate changes, and biotic migrations." i would be so grateful. regionals are coming up so literally any advice soon would be super awesome

[OrigamiPlanet]

Does anyone know if we will need to make formulas with isostasy to calculate density/weight etc of continental crusts or anything of the sort? also, if anyone has info on "f. Continental drift's role on opening and closure of ocean gateways and land-bridges, with specific reference to ocean circulation changes, climate changes, and biotic migrations." i would be so grateful. regionals are coming up so literally any advice soon would be super awesome

You will most definitely need to know how to calculate the sort of isostasy; those are usually your math related portions of the test, otherwise it will most likely be plate tectonic movement. You'll want to know what ocean gateways and land-bridges are, and then know maybe the history of the two. One especially good one to know is the isthmus of Panama and how that affected the Americas and the animals inhabiting it. That's really all I have for you, if there is anything you want me to clarify further, tell me.

[knottingpurple]

Does anyone know if we will need to make formulas with isostasy to calculate density/weight etc of continental crusts or anything of the sort? also, if anyone has info on "f. Continental drift's role on opening and closure of ocean gateways and land-bridges, with specific reference to ocean circulation changes, climate changes, and biotic migrations." i would be so grateful. regionals are coming up so literally any advice soon would be super awesome

Calculating the height of different crustal features based on the density and thickness of different layers, and vice versa, using principles of isostasy, is quite a standard type of problem which I would definitely recommend practicing (there's a really complicated version of such a problem in last year's MIT DP test, which you can find publicly on their website).

The other part of your post is a question everyone's been asking for 2 years, so...

[Nerd95]

Does anyone know if we will need to make formulas with isostasy to calculate density/weight etc of continental crusts or anything of the sort? also, if anyone has info on "f. Continental drift's role on opening and closure of ocean gateways and land-bridges, with specific reference to ocean circulation changes, climate changes, and biotic migrations." i would be so grateful. regionals are coming up so literally any advice soon would be super awesome

Calculating the height of different crustal features based on the density and thickness of different layers, and vice versa, using principles of isostasy, is quite a standard type of problem which I would definitely recommend practicing (there's a really complicated version of such a problem in last year's MIT DP test, which you can find publicly on their website).

The other part of your post is a question everyone's been asking for 2 years, so...

I find this reading to be quite good to address the second question. It's a bit technical but a really solid overview of plate tectonics and climate. Lots of good details from Earth history in there! Enjoy!

Find it here: https://www.geo.umass.edu/climate/paper ... limate.pdf

[SHASO2018]

Do any of you know what is usually done at the timed stations for this event?

While this event is rarely station-based despite substantial effort by the National Committee, if it is, the stations tend to be more application-based (though, not always, and written tests can certainly be heavily application-based).

Thanks!

I don't know if it has necessarily changed for plate tectonics, but when I did DP 2 years ago when it was oceanography, my states tournament was station based. It just separated the test into (I think 6) parts that were all related. It was quick, but you had time to go over all of the stations at the end. Hope this helps!

[UTF-8 U+6211 U+662F]

While this event is rarely station-based despite substantial effort by the National Committee, if it is, the stations tend to be more application-based (though, not always, and written tests can certainly be heavily application-based).

Thanks!

I don't know if it has necessarily changed for plate tectonics, but when I did DP 2 years ago when it was oceanography, my states tournament was station based. It just separated the test into (I think 6) parts that were all related. It was quick, but you had time to go over all of the stations at the end. Hope this helps!

I wouldn't say stations are too rare. I think the Rustin and PA state tests were both in stations.

[Ethancheese123]

Could someone give me an explanation of what gravimetry is?

[Unome]

Could someone give me an explanation of what gravimetry is?

Measurement of gravity anomalies, I assume. The wikipedia page on gravity anomalies gives a decent overview of the subject, though definitely supplement it with some of the college lectures out there.

[Ethancheese123]

Thanks, also, do we need to know different type of rocks?