Which of the following churches contains great examples of the use of ribbed vaulting?
a.
Durham Cathedral
b.
St. Etienne
c.
Church of San Clement
d.
Both A and B

Why are slanted roofs found on many buildings within russia and finland? a. to prevent ice slides. b. to prevent the build-up of water during heavy rains. c. to prevent heat from escaping during the clod winter months. d. to prevent snow build-up.