Lecture 13

Lecture 13 - Lecture 13 Late Proterozoic Life and The...

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Lecture 13- Late Proterozoic Life and The Cambrian Explosion A. Snowball Earth-  Glaciation- think extensive perennial ice that produces distinctive  features  Glaciation normally occur at the polars, occurs at high latitudes and also high  altitudes, usually limited to cooler areas Snowball Earth- there are times when glaciers occurred in (or near) equatorial  regions AT SEA LEVEL- 710, 635, 585 Ma o Ice covered ocean down to equator, these extreme ice ages may have lasted  for millions of years, didn’t lead to mass extinction Shutdown of photosynthesis and the hydrologic cycle B. Albedo- Reflectivity- The amount of radioaction depends on the type of material it comes into contact  with Albedo- % of incoming radiation reflected back into space or relatively, average  albedo of Earth is 30% C.  The Freeze- Fry: The Freeze- Large land areas clustered, the latter would increased albedo, less overall energy  retained by Earth’s atmosphere Long term carbon cycle become imbalanced, atmospheric levels of CO2 levels 
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Lecture 13 - Lecture 13 Late Proterozoic Life and The...

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