Snowball Earth.

• Autores: Paul F. Hoffman, Daniel P. Schrag
• Localización: Scientific American, ISSN 0036-8733, Vol. 282, Nº. 1, 2000, págs. 68-68
• Idioma: inglés
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• Resumen

  • Suggests that the Earth endured an Ice Age that crystalized the entire planet about 600 million years ago, during the Neoprotozoic Era. Termination of the Ice Age from record carbon dioxide levels caused by surviving volcanoes; Evidence of glaciers at sea level in tropical regions; Ability of snow and ice to persist by reflecting waves of radiation; Survival of some forms of microscopic algae; Comments from researchers.