How many hours of flying would it take in one year for a person to double his or her yearly radiation dose

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?

How do cracks affect the rate of weathering?

Which statements best describe energy? check all that apply. the total amount of energy in the universe remains constant. the total amount of energy in the universe changes constantly. energy cannot be converted from one form to another. energy can be converted from one form to another. energy cannot be created or destroyed. energy can be created or destroyed.