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View Diary: DKos Special Supplement: Plate Tectonics And The World’s Changing Geography (Part 2 of 2) (68 comments)

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  •  The upper crusts are granitic & basaltic (1+ / 0-)
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    The lower halves of the plates consist of denser material. The continental plates have basaltic bottom halves and the oceanic plates have ultramafic bottoms.

    Yes, it's a matter of relative densities, not weights. That's one simplification too far.

    The mechanics of geosynclines never made sense to me either.

    look for my eSci diary series Thursday evening.

    by FishOutofWater on Wed Apr 17, 2013 at 07:49:40 AM PDT

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    •  hell, we both can't be 'rong (sic), right? (2+ / 0-)
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      RiveroftheWest, FishOutofWater

      just kidding. When it comes to specifics about specific topics I tend to play it say and shrug my shoulders. Your erudition on ultramafic bottoms and such. . .spot on. As for geosynclines and its theories. . .as I stated I'm a plate man and thinker. Just makes more sense to me. Surprising, too, how far geology, the youngest of all earth sciences, has come in, say, 50 years. What will tomorrow bring, indeed?

      Treat the world (yourself, and others) as part of a living organism. Everyone and everything will benefit.

      by richholtzin on Wed Apr 17, 2013 at 08:26:22 AM PDT

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