Of the eight most abundant elements in earths crust, what percentage does the six next most abundant elements of earths crust make up?

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Need people build a dam to create a reservoir that supplies water a nearby city needs. describe two ways this action will likely affect the water cycle in the local environment. (5 points) worth 20 points

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone