Beginning of Notes
Jan 17, 2007
physical geology- deals with processes at or beneath the earths surface.
: It’s immensity (Billions of years) is very hard to grasp.
second- hours: earthquake, volcano
Hundreds of years: erosion
Millions of years: evaluation
Tens of million-billion years: mountain range forming
Universe is about 15 Billion years old
Solar system 4.5 Billion years old (4,500,000,000). Sun with 9 planets
a.) Terrestrial- small, rocky, dense-mercury. Venus, Earth, Mars.
b.) Jovian- Large, Gassy, Light. Jupiter, Saturn, Uranus, Neptune.
Solar system formed from relatively cold material
Formed from Nebula of gas and dust that undergoes
Earth warms up very rapidly
Collision, aluminum heating,
– Inner layer heating,
Decay of radioactive materials –
Inside earth, continues today.
Early Earth became(partially) molten. Caused in part by collision with Mars size body;
created moon, then cooled down.
Rocks are very poor heat conductors
Once crust forms, inside still remains very hot- even today: 5,000
Earth may be uniform in composition (inside and outside) at first, but because of heating
Once temperature is high enough, iron melts and falls to the center, causes release of energy and