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Photograph showing red-brown buttes of sedimentary rocks incised by the sediment-rich brown water of the Colorado River.
Grand_Canyon_20230908_Brennan.jpg
Grand_Canyon_20230908_Brennan.jpg
Plot of Radium concentration vs. road salt application rate
Plot of decadal change in Radium concentration vs. road salt application rate
Plot of decadal change in Radium concentration vs. road salt application rate
Plot of decadal change in Radium concentration vs. road salt application rate

Graph of decadal change in Radium concentration compared to road salt application rate (Lindsay and others, 2021). Increases in concentrations of radium are correlated with road-salt application, and multiple lines of evidence support that the relation is causal. 

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