Many sidewalks have areas that are uneven or even completely broken. This is usually caused by A. tree roots wedging underneath
B. lichen living on the surface.
C. oxidation of the cement due to oxygen.
D. contact with other rocks.

1. if you have a gas at 127 degrees c, what is it's absolute temperature (kelvin)? a. 200kb. 300kc. 400kd. 500k2. if you had a gas whose absolute temperature measured 45 k, what is that temperature in celsius? a. -228 cb. -300 cc. 125 cd. 112 c

What is the lowest number energy level where a d sublevel is found

Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12