| A | B |
|---|
| solar system | the sun, the planets and other bodies that revolve around the sun |
| De LaPlace | guy who came up with the Nebular Hypothesis |
| nebula | rotating cloud of gas and dust |
| solar nebula | rotating cloud of gas and dust from which the sun and plaets formed |
| Sol | our stars name |
| planetismals | small bodies from which a planet originated |
| protoplanets | larger pre-planet bodies |
| the inner planets | mercury, venus, Earth and Mars |
| outer planets | Jupiter, Saturn, Uranus, Neptune |
| gas giants | planets composed mostly of gases, have low density, and are huge. |
| differentiation | denser materials sinking to the center, and less dense materials moving to outer layers. |
| core | the center of Earth, made from iron and nickel |
| mantle | iron an dmagnesium rich rock surrounding the core. |
| crust | Silica rich rock in the outermost layer of Earth |
| outgassing | Volcanic eruptions releasinglarge amounts of water vapor, nitrogen, methane, sulfur dioxide and ammonia. |
| ozone | molecule that contains three oxygen atoms |
