True of false, and why?

True of false, and why? In a petroleum or crude oil reservoir, oil is at the top, gas is in the middle and water at the bottom. Briefly but specifically compare a geologic map and a topographic map.Explain one potential impacts of volcanic ash on:  1) global warming; and 2) the human food chain (be brief and specific).Part A: Name the chemical compound that is believed to be the most significant contributor to the occurrence of acidic precipitation (acid rain). Part B: List three detrimental environmental effects due to acid precipitation.