I have dealt with convection a fair amount. It is a MINUSCULE force.. That red and blue convection at about 2 minutes - has anyone at ANY time ever tried to quantify the actual forces delivered to the underside of the lithosphere? Vertically? Horizontally? As an engineer I occasionally dealt with convection, and I tell you convection is a VERY WEAK force. In addition, as it rises, it has big time drag with the surrounding fluid. Maybe some people think convection is powerful. I sure as heck don't. In mantle plumes, the convection is a vertical vector. Taking that vertical vector and making a right-angle turn, that is a REALLY inefficient turn, losing MASSIVE mounts of energy. And it takes a unidirectional weak vertical force and spreads it out over 360°. And every time the distance from the plume is doubled, the horizontal force is reduced by D^2. Talk about low psi in the horizontal direction -especially out at a few thousand kms. And THEN they can only apply force by the little boundary layer and the tiny bit of residual drag force there. Every part of this entire hypothesis just screams "INADEQUATE!!". Just from an engineering POV, I have never bought into this. I have always thought they dreamed this up because they didn't have anything better - and they didn't think it through. I just disagree on this entire principle. I worked with forces for 40 years, so I have SOME appreciation for forces. Convection is about the weakest one I know. And they have right-turned convection moving continents. Ay yi yi.
Wegener had a decent glimpse, but what geologists have done with his glimpse is an insult to Wegener. I am of the opinion that he is only possibly 35% possibly right in the first place, though. And the projections back in time to Pangaea? Hey, anyone can make a model do anything they want it to. It's all in the constants, the code and the assumptions.
At 10:00 he mentions the density increase of the descending slab as a "driver of convection". It isn't denser just because of the temperature difference. As it descends and the pressure increases, it undergoes a metamorphic reaction and transforms to denser minerals. It's the descending slab that does the work, not the upwelling mantle.
@@raspberryridge8840this is actually a pet peeve of mine. It’s well known among geologists that Slab Pull, like you said “the descending slab” is the driving force behind tectonic motion
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Thank u sir..for the explaination.It help me a lot.
I have dealt with convection a fair amount. It is a MINUSCULE force.. That red and blue convection at about 2 minutes - has anyone at ANY time ever tried to quantify the actual forces delivered to the underside of the lithosphere? Vertically? Horizontally? As an engineer I occasionally dealt with convection, and I tell you convection is a VERY WEAK force. In addition, as it rises, it has big time drag with the surrounding fluid. Maybe some people think convection is powerful. I sure as heck don't. In mantle plumes, the convection is a vertical vector. Taking that vertical vector and making a right-angle turn, that is a REALLY inefficient turn, losing MASSIVE mounts of energy. And it takes a unidirectional weak vertical force and spreads it out over 360°. And every time the distance from the plume is doubled, the horizontal force is reduced by D^2. Talk about low psi in the horizontal direction -especially out at a few thousand kms. And THEN they can only apply force by the little boundary layer and the tiny bit of residual drag force there. Every part of this entire hypothesis just screams "INADEQUATE!!".
Just from an engineering POV, I have never bought into this. I have always thought they dreamed this up because they didn't have anything better - and they didn't think it through. I just disagree on this entire principle. I worked with forces for 40 years, so I have SOME appreciation for forces. Convection is about the weakest one I know. And they have right-turned convection moving continents. Ay yi yi.
Wegener had a decent glimpse, but what geologists have done with his glimpse is an insult to Wegener. I am of the opinion that he is only possibly 35% possibly right in the first place, though.
And the projections back in time to Pangaea? Hey, anyone can make a model do anything they want it to. It's all in the constants, the code and the assumptions.
At 10:00 he mentions the density increase of the descending slab as a "driver of convection". It isn't denser just because of the temperature difference. As it descends and the pressure increases, it undergoes a metamorphic reaction and transforms to denser minerals. It's the descending slab that does the work, not the upwelling mantle.
@@raspberryridge8840this is actually a pet peeve of mine. It’s well known among geologists that Slab Pull, like you said “the descending slab” is the driving force behind tectonic motion