| A | B |
|---|
| A solar system is | a star and all the objects that travel around it |
| Earth has day and night because | it rotates on its axis |
| The inner planets are mostly | hard and rocky with craters and few moons |
| Scale models help us to understand the solar system because | they show relative size and distance of the planets |
| Jupiter, Saturn, Uranus, and Neptune are known as the | gas giants |
| What is the scientific name for shooting star | meteor |
| We see the moon's phases because | we see different amounts of the moon's lighted surface |
| Earth has seasons because | it has a tilted axis and it revolves around the sun |
| A year on another planet may be longer than a year on Earth because | the planet has a bigger orbit |
