Linda Sohl

Is the early evolution of life on Earth the key to resolving the Faint Young Sun paradox? part of Early Earth:Key Questions about the Early Earth
Content page discussing the Faint Young Sun paradox and whether early life evolution—particularly methanogen activity—was key to maintaining Earth's early climate, covering atmospheric composition, greenhouse gas models, and genomic timelines, part of the "Teach the Earth" geoscience education collection.

What is our current understanding about the origin of the atmosphere? part of Early Earth:Key Questions about the Early Earth
This educational web page from the Teach the Earth portal explores current scientific understanding of the origin of Earth's atmosphere, contrasting older volcanic outgassing theories with newer models involving water-rich planetesimal impacts, and provides classroom integration strategies and references for educators.