Because GPS has not been available for that many years.
GPS data IS enough to confirm that a point on the Earth's surface has moved
since the GPS unit was installed there. Some very exciting work in seismology
and vulcanology is being done exactly that way, right now.
no
Their evidence comes from rocks at earths surface.
the moving of the plates under the earths surface
moving tectonic plates on earths surface
plate tectonics are moving plates under the earths surface
earthquakes
seasons
It is the agent of erosiion that has shaped by earths land surface.
one major contributor is moving water
It is the agent of erosiion that has shaped by earths land surface.
Plate tectonics.
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