oriel36 wrote:
The Nepalese Earthquakes brings to mind the enormous rotational forces
that go into shaping the thin surface crust and although the loss of life
is tragic,the diversity of structures on the surface are shaped by the
relationship between the motion of the fluid and the fractured crust.

The creation of Oceanic crust is central to the narrative as the build-up
of pressure created along the Mid Atlantic Ridge as new crust develops
affects the destruction of the crust locally at all the other boundaries
. One part of the puzzle where crust is created locally and destroyed
locally came one day while walking along a beach after a storm and
dwelling at a fast moving stream eroding a sand bank and very much like
this borrowed video from a Scottish beach-

https://www.youtube.com/watch?v=bKrbXPKz-Zw


What makes plate tectonics possible is a differential between the fluid
interior moving faster than the surface crust across latitudes by virtue
that all celestial objects with viscous compositions rotate in bands with
the assumption that the fluid interior of the Earth in contact with the
crust acts in a similar way.

Wrong.