How much gold (au) is extracted per ton of rock ore

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball

Avalue that describes how heavy an object is and is related to the force of gravity is

Which object is most likely represented by a dot?