Erosional rates

Question for the geologists here.

Is the rate of erosion greater or lesser or equal to the rate of build?

Let me qualify that in my terms. When I look at the shoreline, the
mountains, and such I consider the shoreline to be the zero plane of usable
land. So when I look at the mountains and hills and such I wonder if the
speed at which they are produced is greater than the speed at which rain,
wind, and gravity wear them down. I don't mean a specific hill or mountain,
but ALL hills and mountains - one might get ground down in Asia only to be
built up in Africa for instance. Obviously I'm using generalizations here,
so ultimately my question is - is the earth fated to be a flat ocean or can
plate techtonics keep up?


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