D, combination of all the them
Answer: A. Pressure from sediment turned decaying plankton at the bottom of the ocean into natural gas.
Delaware is east of the Mason-Dixon Line, not south of it. The line runs east to west separating PA and MD. It then turns ninety degrees at the wedge formed between PA, MD, and DE and runs north to south.
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Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases
Short-term air pollution can aggravate the medical conditions of individuals with asthma and emphysema.
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