Snowball Earth. Presented by Mindi Purdy and Jen Ulrich. Theory of Snowball Earth. Many lines of evidence support a theory that the entire Earth was ice-covered for long periods 600-700 million years ago.
Presented by Mindi Purdy and Jen Ulrich
What is an isotope?
But that’s not the whole story…
The Neoproterozoic “Freeze-Fry”
Extremophiles are organisms that live in extreme conditions. Evidence for survival of these organisms during snowball earth events are found in these areas:
Could the freeze-fry events have actually encouraged evolution?
Inertial-Interchange True Polar Wander:
Evidence for open ocean at equator:
Varanger simulation which combines reduced solar luminosity, 40 ppm of CO2, and reduced ocean heat transport. The simulation runs 60 model years from initial, non-snowball conditions until an equilibrium result is obtained.
Survival of life without sunlight/oxygen: