41–50 of 83 posts
Note that this isn’t necessarily what the continent would look like if all the ice melts. The lack of ice weight would allow the land to rebound upwards: https://polarjournal.ch/en/2022/07/13/what-greenland-and-ant...
I mean it's what the content would look like for a long time, Scandinavia is still not done rising from the last glacial period.
http://www.seismolab.org/model/antarctica/lithosphere/index....
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My understanding is that it is a physical property, arising from the fact that crustal basically all crustal growth occurs in ocean floors . The locations of the continents spend the vast majority of the time either approaching a clustered state, or leaving it. Because the thick continents with land are a minority of the surface [2], They only briefly pass through a period of even dispersal when passing from one clus…
> The math is the same as flipping a coin 7 times [...] I'm not saying that a particular hemisphere has a high change of having most of the land; I'm saying that there will be a hemisphere that has this chance. 29% of Earth is land and 80% of this land is in the land hemisphere, so this problem would be the equivalent of rolling a D48 14 times and placing the dice on a table so that any 11 of the rolled numbers are v…
I think that is also fairly solvable. let me think on it. I cant understand your example, but is this the same?:
Roll a d100 once per continent (e.g. 7 times) and write the numbers down. What percent of the time can you pick a range 50 numbers that captures all 7 results. the range can wrap around from 100 to 0.
The problem would be easy to monte carlo, but I would have to think about how to solve it in closed form.
Will update if I have a solution.
Quite odd article, when I click on picture to enlarge it, it opens completely different site and article from 3 years ago https://scitechdaily.com/high-precision-map-shows-what-the-l... Which I assume is using data from here https://nsidc.org/data/nsidc-0756/versions/3
Edit: without the underwater parts: https://i.imgur.com/tR67Nwq.jpg
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> The math is the same as flipping a coin 7 times [...] I'm not saying that a particular hemisphere has a high change of having most of the land; I'm saying that there will be a hemisphere that has this chance. 29% of Earth is land and 80% of this land is in the land hemisphere, so this problem would be the equivalent of rolling a D48 14 times and placing the dice on a table so that any 11 of the rolled numbers are v…
I see, so if you have the freedom to define hemispheres however you want, what are the chances you can fit a definition that captures the majority. I think that is also fairly solvable. let me think on it. I cant understand your example, but is this the same?: Roll a d100 once per continent (e.g. 7 times) and write the numbers down. What percent of the time can you pick a range 50 numbers that captures all 7 results.…
My question is the probability of being able to choose 11 of the 14 continents so that there exists a hemisphere that contains all of them, like the land hemisphere contains 80% of the Earth's land.
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I think the Australians might have a few objections to that proposal... As one of them, I know I do at least! It is interesting how much more archipelago-like Antarctica is. I wonder if that would mean fewer interior deserts than a large continent like Australia has
> I think the Australians might have a few objections to that proposal... As one of them, I know I do at least! Well, Australia claims about half of Antarctica so as long as we can enforce that claim maybe it's not the end of the country. Just have to declare part of it "New Southern New South Wales" and take it from there. > I wonder if that would mean fewer interior deserts than a large continent like Australia has…
I have always wondered how this would turn out. Currently not many other countries recognise our claims, but so far there's been no reason to enforce them. Given out proximity we are in a good position to enforce them, and the likes of BHP and Rio Tinto would love access to all the possible resources.
Earlier quoted context omitted.
I think the Australians might have a few objections to that proposal... As one of them, I know I do at least! It is interesting how much more archipelago-like Antarctica is. I wonder if that would mean fewer interior deserts than a large continent like Australia has
> I think the Australians might have a few objections to that proposal... As one of them, I know I do at least! Well, Australia claims about half of Antarctica so as long as we can enforce that claim maybe it's not the end of the country. Just have to declare part of it "New Southern New South Wales" and take it from there. > I wonder if that would mean fewer interior deserts than a large continent like Australia has…
It's the other way around - the subtropical ridges are high pressure high altitude masses of dry air that fall to the surface around 30 N & S. This dry air is then sucked back to the equator as the Trade Winds, which further dry out the sub tropics.
> Wish I remembered the name though.
Hadley cell?
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30% of the surface is land. But only 15% of land has land antipodal to it, which certainly initially feels like less than you would expect by random chance. It’s easy to fall into some counterintuitive fallacies reasoning about this though because we’re considering a spherical surface pairwise and you might be tempted to say ‘ah, but we’re counting the antipodal land twice so that probably accounts for the 15%/30% th…
Just for curiosities sake I fell down the rabbit hole and ran the numbers (please someone correct me if I'm wrong on this - it's been a loooooong time since I did statistics). This is all assuming some sort of even distribution of land/water, so the numbers don't reflect real world continental distribution, but I don't know how to account for that. We have a 30% chance of picking a random point on Earth and getting l…
Not sure where 21% comes from - if 3/10 of points are on land, 9/100 antipode-pairs should be land-land, and that means 9/100 / 30/100 = 9/30 = 30% of land should have land opposite it, and conversely 70% should have water?
But the true numbers are 15%/85% - on the actual earth, land is more likely to have ocean opposite it than random chance would suggest.
Analyzing whether items sufficiently far from the ‘expected’ random distribution as to be statistically significant is a rather different exercise though.
Earlier quoted context omitted.
I see, so if you have the freedom to define hemispheres however you want, what are the chances you can fit a definition that captures the majority. I think that is also fairly solvable. let me think on it. I cant understand your example, but is this the same?: Roll a d100 once per continent (e.g. 7 times) and write the numbers down. What percent of the time can you pick a range 50 numbers that captures all 7 results.…
Your example is not the same for two reasons: 1. You are assuming there always are 7 continents and each of them contains 1% of all space on the Earth's surface. I assume there are 14 continents with 2% of the Earth's surface each, which is still incorrect but it's closer to reality. 2. I'm not defining hemisphere however I want: I'm using the canonical definition of hemisphere, but choosing any hemisphere for me dic…
1)When you say you are using the canonical definition of hemisphere, do you mean North and South? Or are you talking about East and West as well?
2) Out of curiosity, why 14 continents?
If you are using North and South as pre-defined hemispheres, ignoring East and West, I do think it can be reduced down to a coin flip if you want to prove that plates are unlikely to almost all be in the same hemisphere. This is because allowing them to overlap allows more clustering, not less.
12/14 continents is >80% and 11/14 is If you drop a continent randomly, it has a 50/50 chance of being in the north or south.
The probability of 12 or more being in the northern hemisphere is 0.647%. The probability of 12 or more being in the southern hemisphere is 0.647%. Together, the probability of 12 or more being in the same N/S hemisphere is 1.294%
You can do the same for E and W, getting another 1.294%, for a total of 2.588% chance. This is allowing the continents to overlap, so the real chance would be lower.
It's gonna be interesting when the poles melt and the major powers war over who gets the land
