26 votes
Accepted

Does the Plate tectonics contradict the theory of continental drift?

The boundary between the African and South American plate is a 'divergent' boundary. The two continents were joined as part of the Pangean super-continent. In the Cretaceous period a rift opened up ...
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  • 1,606
22 votes
Accepted

Is there a geological explanation for the recent Mammoth tusk discovery 185 miles off the California coast?

The mammoth probably died on land. Its remains got picked up by a glacier. The glacier carried the tusk down to the sea. Eventually, the ice containing the tusk broke off as an iceberg. The iceberg ...
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  • 3,038
17 votes

Does the Plate tectonics contradict the theory of continental drift?

Alfred Wegener developed his theory of continental drift in the early 20th century. His theory wasn't well accepted at that time. Geologists of that time had their own not quite scientific ideas ...
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13 votes

Why are there no volcanoes where continents collide with each other?

Or is the continental crust too dry? Exactly this. Continental collision zones are actually full of volcanic rocks, which formed at the time before it was a continental collision zone. The Wikipedia ...
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9 votes

Does the Plate tectonics contradict the theory of continental drift?

"Continental Drift" was a theory developed to explain observed phenomena (the coastline of South America and Africa being but one example). Plate tectonics, on the other hand, is the ...
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6 votes

Does the Plate tectonics contradict the theory of continental drift?

I just wanted to augment the other answers with some pictures. Not only there isn't a contradiction, but plate tectonics confirms and explains continental drift. It's the mechanism by which ...
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6 votes

Are oceanic plates or continental plates heavier?

You're saying... My question is not about the density But then... So if you take for example a cilindrical section with radius 1 meter of both kinds of plate, which will have a larger mass? And ...
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5 votes

When did the proto-Himalayas become non-volcanic?

We don't know for sure because A. the evidence has almost all been erased by the continued crustal shortening of the area where the volcanic arc(s) would have been. B. the region is huge and volcanism ...
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  • 4,227
5 votes

Why are there no volcanoes where continents collide with each other?

Two major reasons, crustal thickening and thermochemical interactions. Heat plumes, whether from crustal recycling or the deep mantle, can only melt through so much rock before they lose heat and ...
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  • 4,227
2 votes

Is there any research on the relation of asteroid impacts and hot-spots?

This question has been researched for decades. Here are two examples of such studies (you can find more by looking at articles citing those two). In Assessment of Antipodal-Impact Terrains on Mars, ...
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2 votes

Can continental plates collide and fuse together without an orogenic band or magmatic arc or at the junction?

You didn't dive deep enough. You're asking about an area on a high-level, generalized map of basement rock provinces. There were several orogenies at the southern boundary of the Wyoming craton. ...
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2 votes

Can continental plates collide and fuse together without an orogenic band or magmatic arc or at the junction?

The interpretation of most of these interfaces is uncertain. Most of these plate boundaries are ancient, poorly exposed, have been metamophosed in later orogenies, and have suffered significant ...
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1 vote
Accepted

How likely are caverns inside the mantle?

It is extremely unlikely that any hollow volumes exist in the mantle. The mantle is a convecting solid which can deform over long timescales. Let's assume that such a cavern did somehow form. Whatever ...
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1 vote

Can garbage be sent into the (near-)center of the world?

There's easier ways to mitigate toxic waste, Since most is often metal, converting it into stable oxides and proper landfilling mitigates most of the danger. Incineration at temperatures above 2800 ...
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1 vote

What role does the hydrosphere play in tectonic plate convection?

Lubrication. Not to mention hydrothermal vents which feat ecosystems that at the depth do not depend on sunlight
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1 vote

Tectonic plates terminology

Tectonic plates almost all comprise a mix of both oceanic and continental crust in different areas. The exceptions are all minor plates. Where the edges of these plates spread apart you get divergent ...
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  • 4,227
1 vote

When did the proto-Himalayas become non-volcanic?

To begin with, the formation of the Himalayas was never volcanic which is why you don't find volcanic rocks in the Himalayas. As for the subducting Indian oceanic plate (which contained Indian ...
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