Yes, the Moho separates the mantle and the crust. Yes, it does . Interactive Exercise 43. Basaltic volcanoes are generally associated with oceanic spreading. Andesitic volcanoes are generally associated with compression zones.
Thermal metamorphism is linked to igneous intrusions.
Regional metamorphism is linked to orogenic processes. V-shaped valleys are formed by river erosion. U-shaped valleys are formed by glacier erosion. Carbon isotopes, which have a half life of 5570 years, are used to date relatively recent geological events. Rubidium isotopes, which have a half life of 47 billion years, are used to date very old geological events.