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I. Formation of the Earth
A. Collapsing Nebula
1. Density
2. Pressure
3. Protosun
4. Vaporization
B. Rotation
1. Supernova
C. Accretion
1. Planetesimals
2. Protoplanets
D. The sun
1. Hydrogen fusion
II. Vagabonds
A. Surface of the Earth
B. Asteroids
1. Remaining Planetesimals
2. Composition
3. Location
4. Size
5. Threat
C. Comets
1. Composition
2. Location
D. Meteoroids
1. Composition
2. Size
3. Impact
E. Influence
1. Shaped early characteristics
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