when a ball rolls down a hill, what energy conversion occurs?

at the top of hill the ball have potential energy and when it roll down the potential energy convert to kinetic energy.

Explanation:

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."