Comon help me out here Coal is a fossil fuel that is used to produce electricity. Which of these statements best describes a benefit of coal mining on the region around the mines? It gets abundant electricity. It becomes rich in minerals. Its groundwater is less contaminated. The rate of evaporation decreases for local rivers.
its not C

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)