

theory
hypothesis
scientific method
Big Bang (13.8 billion years ago)
Forces:
gravity
electromagnetic
strong nuclear force
weak nuclear force
meteorites: iron-nickel, stoney
terrestrial (rocky) planets: Mercury, Venus, Earth (Moon), Mars
Jovian (gas giant) planets: Jupiter, Saturn, Uranus, Neptune
accretion
solar nebular theory
formation date: 4.6 billion years ago
Earth
originally uniform composition
gravitational magmatic segregation
core density 10-13
mantle density 3.3-5.7
crust density 2.7
theory of organic evolution
Charles Darwin (1859): On the origin of species
fossils
geologic time
Uniformitarianism