34 1

Origin of Planet Earth(also see pp. 55-58 in book)

A. Stellar explosionB. Spinning nebular

cloudC. Gravitation of dust

particles and gasesD. Further collision and

aggregation of proto-planets

E. True planets form about 4.6 billion years ago

36 2

Clay Minerals and Organic Molecules

• Sites that facilitate organic chemical reactions

37 3

Origin of Organic Molecules

38 4

Origin of Life

• Hydrothermal vent as a possible site for the origin of life

39 5

Metabolic Reactions

• Order of occurrence:

1. Fermentation (Archaea)

2. Chemosynthesis (Archaea

3. Photosynthesis (Eubacteria, cyanobacteria)

4. Respiration (Eukaryotic animals)