Question

A vault springs from a(n) _____________, which is supported by both a solid wall and four columns.

a. cornice
b. keystone
c. pendentive
d. springing line

Answer 1

The vault springs from a keystone, supported by a wall and four columns.

Step-by-step explanation:

The vault springs from a keystone, which is supported by both a solid wall and four columns. The keystone is the central, wedge-shaped stone at the top of an arch that locks the other stones in place and provides stability to the structure. In this case, the keystone serves as the central support for the vault.