Question 3 -to Plate Tectonics
The plate tectonics believes that there were several ( at least 3 or 4) Super continents prior to the latest -Pengea-
Several times these continents were broken down in various plates again combined to form another super continent
Now here is the third question..in fact series of questions 3a,3b,.....etc
3a)If there were Super continents prior to Pangea and they were broken up several times,where are those plate boundaries of earlier break ups?
Are those plate boundaries are merged and become homogenous plate ?
What are the chances of the current plate boundaries being merged ?
3b) What makes those super continents break ? Are thise heat currents?
if so , are those heat currents were there earlier to formation of Supercontinent?
if yes, those heat currents will not allow the supper continent form at that in first place? Are those heat currents changes
location or direction? How and why?
3c) Why there are more land mass at poles and less at equator?
3d) Why the plates near to equator move faster and those near poles are nearly stand sill?
3e) What are the basis of believing how earlier Supercontinents look like?
3f) Can a plate which has crossed equator and moving towards poles can come back to equator?
All those who support plate tectonics in general and USGS National Innovation Center in perticular to answer these questions
Amit Dave
5 comments:
Amit;
Regarding your 3c comment, look at a globe. The south pole has only tiny Antarctica
and the north pole has no land mass at all. (above water)
Roger
Roger
Look at this way
Land mas between 0 to 20 degree north or south
And
Land mass at 60 and 80 degree north or south,which is more in 20 degree lattitudes?
What you are telling will ultimately happen after few million years
Amit
It's hard to estimate but it looks to me like more near equator. I don't think much will change with time. North America can't go South because South America blocks it. Africa may move further south to better balance things.
Anything moveable should approach equator, not poles.
Roger
We need a smooth basketball size sphere to play with. I say things will move toward the equator because of the centrifugal force of rotation. You say toward the poles for the same reason (I think).
But the earth has very little at the poles and a lot near the equator.
Roger
Amit;
I have a 12" sphere; a globe. I made a paper disk about 3/4" in diameter, moistened it slightly and stuck it on China. Then I spun the globe rapidly.
Result: the disk did not move until the moisture evaporated. Then the disk fluttered off into space.
No help there.
Roger
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