9.1.3 Proterozoic Eon

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12 Terms

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Proterozoic Eon

The 3rd known eon in Earth’s history

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2.5 Ga – 542 Ma

When did the Proterozoic happen

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mega annum or 1 million years

Meaning of Ma

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Glacial Period

The cold period of an Ice Age

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Interglacials

The warm period of an Ice Age

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Concentrations of CO2 and Methane; Milankovitch Cycles; Motion of Tectonic Plates

3 causes of Ice Age

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Variation in Earth’s orbit

What is Milankovitch Cycles

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23.5 degrees

Obliquity of Earth

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22.1 degrees

The minimum tilt of Earth which promotes growth of ice sheets

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24.5 degrres

The maximum tilt of Earth which promotes growth of ice sheets

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41,000 years

How many years does it take for Earth’s obliquity to complete 1 Milankovitch cycle

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