Fossil fuels can usually be found in layers of what?

made up of plankton and plants is what turns into fossil fuels

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

yes it is weird but true