Why is the Earth blue?
The greenhouse effect and plate tectonics are essential for maintaining water on the Earth’s surface.. (Image: © NASA/Goddard Space Flight Center/Reto Stöckli, CC BY) This article was originally published at The Conversation. The publication contributed the article to Space.com’s Expert Voices: Op-Ed & Insights. Guillaume Paris, Géochimiste, chargé de recherche CNRS au Centre de recherches pétrographiques et géochimiques …