AUTHOR=Steefel Carl I. , Navarre-Sitchler Alexis , Sullivan Pamela L. TITLE=Editorial: Chemical Export to River Systems From the Critical Zone JOURNAL=Frontiers in Water VOLUME=3 YEAR=2022 URL=https://www.frontiersin.org/journals/water/articles/10.3389/frwa.2021.826731 DOI=10.3389/frwa.2021.826731 ISSN=2624-9375