Tailings are dangerous because they can
a. release toxic elements into the groundwater or surface water.
b. decrease the amount of nonrenewable resources available.
c. be very explosive.
d. increase the chances of a volcanic eruption.

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.