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Tags geography , Land Mass

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Old 18th February 2021, 11:19 PM   #81
EHocking
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Originally Posted by Vixen View Post
Why is the larger part of the world's land mass mostly in the north?
42,000 years ago, they were not...
https://www.livescience.com/magnetic...years-ago.html
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Old 19th February 2021, 03:28 AM   #82
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Originally Posted by EHocking View Post
42,000 years ago, they were not...
https://www.livescience.com/magnetic...years-ago.html
Only trouble is that the last time the magnetic field reversed was 800,000 years ago. So either we have learnt something or what you have linked is rubbish.



http://www.geomag.bgs.ac.uk/education/reversals.html
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Old 19th February 2021, 03:50 AM   #83
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https://en.wikipedia.org/wiki/Laschamp_event

Quote:
The Laschamp event was a geomagnetic excursion (a short reversal of the Earth's magnetic field). It occurred 41,400 years ago, during the end of the Last Glacial Period. It is known from geomagnetic anomalies discovered in the 1960s in the Laschamps lava flows in Clermont-Ferrand, France.[1]

The Laschamp event was the first known geomagnetic excursion and remains the most thoroughly studied among the known geomagnetic excursions.[2]
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Old 19th February 2021, 04:18 AM   #84
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Originally Posted by Pixel42 View Post
Plate techtonics are a more leisurly game.
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Old 19th February 2021, 05:26 AM   #85
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It's possible* that civilization could only arise in a world with the land mostly near one of the poles, rather than more evenly distributed north-south, and so any online discussion would take place in such a world.

It's likely that the pole where most of the land was clustering would be defined as North.


I don't mean this very seriously. Putting this post's chance of being at all reasonable around 5%.

*because of it's effects on climate.
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Old 19th February 2021, 08:16 AM   #86
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Originally Posted by rjh01 View Post
Only trouble is that the last time the magnetic field reversed was 800,000 years ago. So either we have learnt something or what you have linked is rubbish.

http://www.geomag.bgs.ac.uk/education/reversals.html

It's referring to to the Laschamp event.
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Old 19th February 2021, 04:31 PM   #87
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Originally Posted by rjh01 View Post
Only trouble is that the last time the magnetic field reversed was 800,000 years ago. So either we have learnt something or what you have linked is rubbish.

http://www.geomag.bgs.ac.uk/education/reversals.html
Hopefully, “we” have learned something.
Laschamp eventWP
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Old 19th February 2021, 11:31 PM   #88
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Originally Posted by Roboramma View Post
It's possible* that civilization could only arise in a world with the land mostly near one of the poles, rather than more evenly distributed north-south, and so any online discussion would take place in such a world.

It's likely that the pole where most of the land was clustering would be defined as North.


I don't mean this very seriously. Putting this post's chance of being at all reasonable around 5%.

*because of it's effects on climate.
Actually, far more than 5%, IMHO, but I would approach it from a completely different angle.

Namely that, forget civilization. To have good enough conditions for very complex life, for the whole billions of years needed to evolve intelligence from scratch, you NEED a world with plate tectonics. Otherwise:

A. you'll lack a magnatic field, which will <bleep> up your atmosphere and get rid of your water,

and even more importantly

B. a planet of sufficient size to hold on to much of an atmosphere at all, will have an active enough core. Without such tectonics it would just periodically overheat and completely melt and swallow its crust, like Venus does. You don't get to evolve to civilization stage when every few millions of years the whole planet turns into a lava pool

So if you're having this discussion, it will be on a planet where the continents move around more or less randomly, depending on where those cracks formed that push them around. So no matter how that imaginary civilization names its directions on a map, let's say, flub, blub, foo and bar, chances are at any given moment they would have moved to be more mass in flub than blub, or viceversa.
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Old 19th February 2021, 11:43 PM   #89
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Without plate tectonics there'd also be no source of new rocks from which to make new soil to replace old soil once it's been damaged or washed away. (This is already a big contributor to the challenges for life in general in Australia just since it separated from the other continents.)
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Old 20th February 2021, 01:21 AM   #90
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Well, that is very true, though you probably wouldn't have much soil, nor much in the way of minerals other than silica for that soil (or really for any life,) after the first time the whole planet turns into a molten ball of lava. Heavier stuff would just sink.
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Old 20th February 2021, 04:33 AM   #91
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Originally Posted by HansMustermann View Post
So if you're having this discussion, it will be on a planet where the continents move around more or less randomly, depending on where those cracks formed that push them around. So no matter how that imaginary civilization names its directions on a map, let's say, flub, blub, foo and bar, chances are at any given moment they would have moved to be more mass in flub than blub, or viceversa.
Absolutely, though I'm wondering how much of the time you'd get say 10% more land mass in one hemisphere than the other, and how much of the time it's more like 50% more, or 2x or 3x more, etc. What's the distribution, and where does the current situation fit on that distribution.

In other words, regarding the OP, is the current situation pretty much explained by the fact that the continents move at all, or is it a pretty unlikely configuration which could be coincidence but might be worth looking for some other factor (anthropic or not) to explain it?

I'm guessing the current state isn't very far from what we'd expect at random, to be honest.
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Old 22nd February 2021, 08:42 PM   #92
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It's because the South Pole is actually the top of the world and, because rock is denser than water, all the landmasses have slid down to the bottom.
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Old 22nd February 2021, 11:20 PM   #93
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Originally Posted by PhantomWolf View Post
It's because the South Pole is actually the top of the world and, because rock is denser than water, all the landmasses have slid down to the bottom.
Most of the Helium reserves in the world are under the "northern" continents, so they float to the "top".
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Old 23rd February 2021, 09:52 AM   #94
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Because there is water on the rest of it?
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Old 23rd February 2021, 12:54 PM   #95
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Originally Posted by sphenisc View Post
Centrifugal force. The dense, heavy basaltic rocks of the sea floor are thrown outwards towards the rim, so the lighter rocks of the continental land masses float in towards the centre.

The question is about the land mass being greater in the North not on the Equator.*

Oh, by the way, centrifugal force does not exist.

* Where centripetal acceleration is greatest.
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Old 23rd February 2021, 01:14 PM   #96
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Originally Posted by Hellbound View Post
The way we draw maps


I have been thinking about how to say this but I would have used many more words. This makes the point succinctly. It's all really rather human-centric and arbitrary. If the first map makers lived in the southern hemisphere then "north" would be reversed 180 degrees and we would be viewing the world upside down.
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Old 23rd February 2021, 01:33 PM   #97
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Originally Posted by Steve View Post


I have been thinking about how to say this but I would have used many more words. This makes the point succinctly. It's all really rather human-centric and arbitrary. If the first map makers lived in the southern hemisphere then "north" would be reversed 180 degrees and we would be viewing the world upside down.
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Old 23rd February 2021, 01:41 PM   #98
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Originally Posted by theprestige View Post
I still feel like you should be able to find Mt Everest or the Mariana Trench on a billiard-sized Earth by running your thumb over it. Or by licking it.
Maybe. Let's hope nothing actually licks the Earth to find out.

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Old 23rd February 2021, 01:43 PM   #99
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Originally Posted by alfaniner View Post
What if we've had the maps upside-down all this time?
The orientation of maps is entirely arbitrary. These days, the convention is that north is up, but it wasn't always so.

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Old 23rd February 2021, 02:49 PM   #100
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We can measure the movement of the plates.

India for example is moving north in to Asia, hence the mountains.
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Old 23rd February 2021, 04:19 PM   #101
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At one time, maps were centred on Jerusalem.
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Old 26th February 2021, 02:55 AM   #102
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To some extent I think people are missing out on what the question really is.

Imagine a world in which all the land was clustered in a single continent whose coastline was all equidistant from the North Pole. There'd certainly be something odd and in need of an explanation in that case.

Perturb that world a little, so that the coastline includes some irregularities, some parts a few miles further from and some parts a few miles closer to, the North Pole. Still odd, and not something you'd get from a random walk: looking at it, you'd expect some mechanism to lead to that situation.

Keep perturbing it, and you end up with large peninsulas and islands coming off that continent, but again you've still got an odd situation.

Eventually, when we move far enough from the perfect circle around the North Pole, we find ourselves in a situation that's easily explained as just the random movements of the continents over time. While there is some clustering in the northern hemisphere, it's still well within what you'd expect.

We can also look back through time and see that the continents have moved all around the earth, so if there were any mechanism, it would have to be one that applies today but didn't apply in the past.

But again, the important point is that the distribution of the continents, while it may cluster somewhat in the northern hemisphere, isn't clustering in a way that deviates far from random movement over the globe.
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Old 26th February 2021, 08:58 AM   #103
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I thought the question was how any western-educated adult in this day and age doesn't know about plate tectonics and the movement of continents over time.
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Old 26th February 2021, 09:24 AM   #104
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Originally Posted by theprestige View Post
I thought the question was how any western-educated adult in this day and age doesn't know about plate tectonics and the movement of continents over time.
That, plus the alternate hypothesis that must not be ruled out:

"I am guessing it is to do with how the earth spins on its axis?"

Given sufficient time the earth will spin the entire land mass "up" to the north pole where it will remain for all eternity.
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Old 26th February 2021, 01:15 PM   #105
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Originally Posted by Steve View Post
That, plus the alternate hypothesis that must not be ruled out:

"I am guessing it is to do with how the earth spins on its axis?"

Given sufficient time the earth will spin the entire land mass "up" to the north pole where it will remain for all eternity.
My guess is: No.

Hans
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Old 26th February 2021, 01:27 PM   #106
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Originally Posted by MRC_Hans View Post
My guess is: No.

Hans
Mine too. But as a skeptic I maintain the utmost respect for the "well reasoned" thoughts of others.
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