Answer:
Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust.
Answer:
Acid rain is slowly destroying once-resistant granite. Acid rain is created by air pollutants. ... The chemicals fall to earth as acid rain. Of all the building stones, granite is the least susceptible to acid rain because its composition is of feldspar and quartz, both of which resist attacks of acid.
