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Java Games: Flashcards, matching, concentration, and word search. |
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| A | B |
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| What galaxy is Earth in | Milky Way |
| What does rotation mean | spinning |
| The age of the Earth | 4.6 billion years old |
| Shape of Earth's orbit | Elliptical |
| Terrestrial planets | Mercury, Venus, Earth, Mars |
| Gas Giants | Jupiter, Saturn, Uranus, Neptune |
| nebula | star formed from dust and gas |
| Mass | `total amount of matter in an object |
| gravity | force that pulls objects together |
| universe | all matter and energy, including outer space |
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