Ancient 'Snowball Earth' thawed out in a flash | Science | AAAS
Giant Impacts Might Have Triggered Snowball Earth Events - Eos
Study explains how primordial life survived on 'Snowball Earth' | Reuters
SNOWBALL EARTH: Geology, Climate Dynamics, Geochemical Cycles and Ecosystem Translocations - School Of Earth, Environment & Society - Faculty of Science - McMaster University