Ch 25 - The history of life on earth (1 slide per page)-2

Ch 25 - The history of life on earth (1 slide per page)-2 -...

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1 The History of Life on Earth Chapter 25
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2 Earth history can be divided into 4 eons Phanerozoic • Hadean Start: ~4.5 bya Total: ~0.7 by • Archaean Start: ~ 3.8 bya Total: ~1.3 by • Proterozoic Start: ~2.5 bya Total: ~2 by • Phanerozoic Start: ~0.5 bya End: ? Total: 0.5 by so far Hadean Figure 25.7 (Campbell 9 th ed)(modified)
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