| A | B |
|---|
| Big Bang Theory | Theorythat explains how the universe was formed. |
| Heat | Energy that exists in the universe. |
| Mercury | Planet with no atmosphere, small gravity force & is closest to the sun. |
| Venus | Planet that is a sister to Earth, is very HOT & has an atmosphere trapping heat. |
| Earth | Planet with liquid water, human life & is made up of 3 layers. |
| Mars | Planet known as the "Red Planet", is rich in iron & has CO2 in it's atmosphere. |
| Characteristics of the "outer planets". | "Gas giants" that are massive, have moons & have rings. |
| Jupiter | Planet that is largest, the "Great Red Spot" & a moon named Io. |
| Sarurn | Planet with 5 moons, low density & a moon named Titan. |
| Pluto | Dwarf planet with 248 year revolution & rocky surface. |
| 365 1/4 days | Earth's revolution. |
| 24 hours | Earth's rotation rate. |
| Neptune | Planet that is cold, blue in color & ha the "Great Dark Spot". |
| Great Dark Spot | Storm located on Neptune's surface. |
| Rotation | One of 2 ways Earth moves. |
| Revolution | Second of 2 ways Earth moves. |
| Sun | What planets, incuding Earth, revolves around. |
| Tilted | Kind of axis Earth has. |
| Seasons | Direct result of Earth's tilted axis. |
| Inner Planets | Mercury, Venus, Earth & Mars |
| Outer Planets | Jupiter, Saturn, Uranus & Neptune. |
| Characteristics of the "inner planets". | Small, rocky surface & closer to the Sun. |
| 1 AU | Distance from the Sun. |
| Stars | Source the planets get their light from. |
| 1/2 | Fraction of Earth that experiences day or night at one time. |
