Biosignatures & Paleobiology: October 2018

A planet's atmospheric constituents (e.g., O₂, O₃, H₂O, CO₂, CH₄, N₂O) can provide clues to its surface habitability, and may offer biosignature targets for remote life detection efforts.

Ecosystem-bedrock interactions power the biogeochemical cycles of Earth shallow crust, supporting life, stimulating substrate transformation, and spurring evolutionary innovation.