Studying gravestones to track changes in Earth’s chemistry. Call for volunteers! EarthTrek presents a global Gravestone Project.

This project aims to map the location of a graveyards around the globe and then use marble gravestones in those graveyards to measure the weathering rate of marble at that location.The weathering rates of gravestones are an indication of changes in the acidity of rainfall between locations and over time. The acidity is affected by air pollution and other factors, and could be used as a measure of changes in climate and pollution levels.