Choose the false statement about the forces acting on a rock that is sitting on the ground. a. the rock has no weight when it is motionless. b. the heavier the rock, the greater the normal force. c. the magnitude of the gravitational force and the normal force is the same. d. the direction of the gravitational force acting on the rock is opposite to the direction of the normal force acting on the rock.

Which of the following statements is a scientific claim? a. the early solar system had large amounts of water; so, the oldest objects in the solar system should also be abundant in water. b. earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea. c. the mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency. d. planet earth is abundant in water, but there is no way to scientifically determine from where earth's water originated.