The dramatically thickened crust extends under gravitational forces, and melting results
when deeper crust rises closer to the surface.
Some of these organic molecules might have evolved as a precursor to life; the rest might have sunk to
the deep crust and mantle to become graphite or diamond, they say.
Megaplumes are squeezed out by
the deep crust because plume water contains helium 3, an isotope that's rare at the surface but more common in deep Earth.
Matthijs Smit of the University of British Columbia examines ancient rocks from
the deep crust in Norway during the summer of 2017.
Schmandt, an assistant professor of geophysics at the University of New Mexico, uses seismic waves from earthquakes to investigate the structure of
the deep crust and mantle.
The north - south variation in minerals indicates that
the deep crust exposed in the southern Rheasilvia region is dominated by pyroxene - rich, diogenitic material while the equatorial region seems to retain the most ancient eucrite - rich mineralogy.
Thin crust,
deep crust, marinara, white sauce, toppings galore and don't forget the cheese!