WHAT IS GEOLOGY?
1. Why study Geology?
1. What’s the Big Bang Theory?
2. Where Did the Elements Form?
3. Basis of Planets
Solar system rotates around sun, which we got our solar system from the Nebular Theory : we get our solar system from all the material that didn’t become a star when the BBT occurred
Planetesimals can exert a gravitational force, diameter over 1 km
o As it sucks in more debris, it becomes a protoplanet.
o Becomes a planet, which is means it has to be roughly spherical, has cleared all debris by pulling it into orbit, and must orbit a star (in our case, the sun). We are a helio centric solar system, meaning all planets in the solar system orbit around the sun
Sun is 99.8% of the mass of our solar system
inner planets: Mercury, Venus, Earth, Mars (Rocky/terrestrial planets, dense alloy iron core, shell of rock, small)
Outer planets: Jupiter, Saturn (gas giants); Uranus, Neptune (ice giants)
- asteroids: chunks of rock and/or metal
- comets: ice with long tails
Part Two: Layers of the Earth
1. Chemical Layers -Differentiation occurred 4.57-4.6 Ga -Planetesimal was homogeneous, no differentiation -Heat generated during collisions -As Earth pulled in debris, matter was squeezed into a smaller volume - radioactive decay also produces heat
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- Spring '07
- Geology, Crust, oceanic crust, mid ocean ridges, old ocean crust