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Proterozoic Eon
The 3rd known eon in Earth’s history
2.5 Ga – 542 Ma
When did the Proterozoic happen
mega annum or 1 million years
Meaning of Ma
Glacial Period
The cold period of an Ice Age
Interglacials
The warm period of an Ice Age
Concentrations of CO2 and Methane; Milankovitch Cycles; Motion of Tectonic Plates
3 causes of Ice Age
Variation in Earth’s orbit
What is Milankovitch Cycles
23.5 degrees
Obliquity of Earth
22.1 degrees
The minimum tilt of Earth which promotes growth of ice sheets
24.5 degrres
The maximum tilt of Earth which promotes growth of ice sheets
41,000 years
How many years does it take for Earth’s obliquity to complete 1 Milankovitch cycle