What is a gray rock composed of a number of different fossilized organisms such as crinoids, trilobites, and
brachiopods, you pour some hydrochloric acid on the rock and notice that it reacts to
the acid.

Which pair of sentences is describing the same velocity? a. a car is parked. a car is moving in circles. b. a bus drives 40 miles per hour north. a truck drives 50 miles per hour north. c. a boy walks east at 6 kilometers per hour. a girl walks west at the same speed as the boy. d. valerie rides her bike south at 8 kilometers per hour. owen jogs south at 8 kilometers per hour.