14 votes
Accepted

Plate Tectonics: Is it possible to have an ocean-continent divergent boundary

The oceanic plates are themselves formed from the divergent boundary, so probably not. Even if a new rifting occurred exactly at the boundary, the result would eventually be that the ocean floor ...
user2821's user avatar
  • 5,946
7 votes

How is dense magma able to rise and punch through continental crust?

Your intuition is quite correct: Other factors being equall, a dense magma will not rise through lighter rocks. The exception is if it is under pressure, in which case a fluid magma will escape ...
Gordon Stanger's user avatar
7 votes

Given that water will center over the mass of Earth, how could Pangaea be the only continent?

Assuming that the surface density is relatively constant, it would be impossible to have all of the above water land mass concentrated on one side of the Earth. That's a bad assumption. Four key ...
David Hammen's user avatar
  • 23.6k
5 votes

Divergent boundary and trenches between oceanic plates

The elevation of oceanic crust is controlled by Pratt isostasy, whereby hotter crust is elevated because it is less dense. Oceanic crust is produced at mid-ocean ridges and cools as it moves away from ...
bon's user avatar
  • 2,211
5 votes
Accepted

Where did the continents come from?

The answer is that we don't know. I could give you a list of all the considerations that go into evaluating that question, but it will probably be incomplete and outdated very soon. There were several ...
Gimelist's user avatar
  • 23.1k
4 votes
Accepted

Movements of the tectonic plates - collison between Indian Plate & Eurasian Plate

As the continental crust is too buoyant (light) to be subducted, when two continents collide they smash against each other creating a mountain range, in this case the Himalayas. This process happen ...
Camilo Rada's user avatar
  • 17.7k
4 votes
Accepted

why continents do not subduct

It is continental crust which hs the greater buoyancy, so when it meets another plate of continental crust neither can subduct. Instead, they collide, crumple and fold, making them thicker and higher. ...
Michael Walsby's user avatar
2 votes

Given that water will center over the mass of Earth, how could Pangaea be the only continent?

OK. Let's assume, for the sake of argument, that oceanic and continental crust does have the same density (it doesn't, but that doesn't matter). Let's further assume that everything under the earth's ...
Semidiurnal Simon's user avatar
1 vote

Plate Tectonics: Is it possible to have an ocean-continent divergent boundary

You May think of this situation as following: Consider an ocean-ocean divergent boundary and one of the oceanic plates (OP) is subducting below the continental plate (CP). Following shows such a ...
Amartya's user avatar
  • 347
1 vote

How is dense magma able to rise and punch through continental crust?

The origin of continental crust is from the differentiation of Earth, where silicates rose to form the mantle and even lighter silicates rose, then cooled, to form the crust of early cratons. Not ...
Gimelist's user avatar
  • 23.1k

Only top scored, non community-wiki answers of a minimum length are eligible