although there are limestone beds located in great depths, why are they not metamorphosed??
1) Marble results from contact metamorphism when limestone/dolomite contacts magma intrusions. Not all limestone beds have magma intrustions. 2) Dolomitization requires the presence of magnesium ions to replace the calcium ions in calcite.
Practice. Some people do take more than 2 days to get the hang of riding or driving confidently.
You need an open space where you can practice legally. Just try to ride slow in a straight line to start then start holding different speeds. When you have done this, then start doing the same around corners
Concerning marble, it would be basically the same reason all shales aren't slate. You can bury sediments fairly deeply before you get the sort of changes you are discussing. Dolomite is a completely different story. That is a chemistry issue more than a P-T issue. In fact, dolomites tend to be primary (synsedimentary or early diagenetic) rather than secondary or metasomatic/metamorphic.
All three can be assisted by looking right through the obstruction – do not look at the few feet in front of the wheel – get your chin up and focus on where you want to go.
