The theory of global warming states that the average temperature of the earth has been increasing over time.
a. allow the measurement of the earth’s temperatures at the poles.
b. reveal how the earth’s temperature has fluctuated in the past.
c. reveal how the earth’s temperature varies from location to location.
d. allow the measurement of the earth’s temperature with greater precision.

Abox that has self-contained cable clamps holds two light switches. a two-wire no. 12 cable with ground feeds the box, and a pair of two-wire no. 12 cables (four conductors) with ground wires leaves the box to feed the light fixtures. the second switch is fed by a no. 12 jumper wire from the first switch. which one of the following box combinations would furnish the minimum allowable volume? a. two 3-inch × 2-inch × 21⁄2-inch gangable device boxes b. two 3-inch × 2-inch × 11⁄2-inch gangable device boxes c. two 3-inch × 2-inch × 23⁄4-inch gangable device boxes d. two 3-inch × 2-inch × 21⁄4-inch gangable device boxes