Questions about mountains?

Question

I would be grateful if you answer my two specific questions:

1. Do mountains (due to their weight) stabilize the ENTIRE crust thanks to their deep roots?

2. If mountains hadn't had existed, would the entire crust have slided (and shaked) drastically over the mantle

due to the important speed of rotation of the Earth?

(note: this sliding has nothing to do with the NORMAL movement of the tectonic plates)

Answer 1

1.  No.  Not all mountains have deep roots.  There are five types of mountains:

dome

fold

fault-block

volcanic

plateau mountains

All of these are formed due to plate movement except dome mountains and, in some cases, volcanic mountains.  Dome mountains are formed by a great amount of melted rock pushing its way up under the earth without folding or faulting.  Some volcanic mountains are formed due to a hot spot in the mantle.  

So rather than stabilizing the crust, most mountains are formed due to movements of the plates that make up the crust.

2.  No.  There isn't an "entire" crust but rather several major and many minor plates that make up the crust of the earth.  If the "important speed of rotation of the Earth" caused the "entire crust" to slide, the mountains also would have been involved in the sliding.  So the existence or non-existence of mountains would not have been a factor.