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Expansion took place before and after this period.
We conclude that it appears unlikely that the Earth has expanded significantly since the Early Mesozoic.
originally posted by: the2ofusr1
Pretty heavy stuff to think about, but as memory of my youth and falling was a common thing that didn't result in any damage ,today ,being much older I no longer fall ,but plummet . I have thought that the expanding earth hypothesis was a reasonable one .With many cosmic rays entering the earth at the poles it would not be far fetched to imagine these particles combining within the earth and forming matter .
According to today's theory mountains should only exist near subduction zones.
Collision results in subduction.
'The Himalayas were formed by collision, not by subduction'
The researchers discovered that as the Indian and Eurasian tectonic plates collide, the Indian lower crust slides under the Tibetan crust, while the upper mantle peels away from the crust and drops down in a diffuse manner.
If it was true the Himalayas would have been there prior to 50 MYA.
What is now referred to as the Tethyan Ocean. Lacking the thickness of a continental mass, it did not cause significant uplift. It was not until the mass of India itself collided that the Himalayas began to form.
What was there prior to the collision, what filled the gap?
It depends upon the nature of the crust at the area of the collision. Collisions between continental masses are not the same as collisions between ocean masses because of differences in the thickness of the crust.
If what you are saying every subduction zone is created due to collision, there must be Himalayas at every plate edge, no?