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Chapter3-UnitE
| Question | Answer |
|---|---|
| What are astroids? | Small,solid,rocky bodies that orbit close to the Sun. |
| What are the giant gases? | The four largest planets-Jupiter, Saturn, Uranus, and Neptune- that are made mainly of hydrogen, helium, and other gases. |
| What is tectonics? | The processes of change in a crust as a result of the motion of hot material underneath. |
| What is a meteor? | When a particle enters Earth's upper atmosphere and the particle and the air around it become hot enough to glow in a brief streak of light. |
| What is a meteorite? | A space object that passes through Earth's atmosphere and reaches Earth's surface. |
| What is one astronomical unit? | Earth's average distance from the sun. |
| What is a comet? | A small, icy object that produces a coma when it gets close to the sun. |
| What is volcanism? | A process that moves molten rock from a planet's interior onto its surface. |
| What is an ellipse? | The shape of the planet's orbits in our solar system. |
| What are the terrestrial planets? | The closest planets to the Sun-Mercury, Venus, Earth, and Mars- that all have rocky crusts and dense mantles and cores. |
| What is a ring? | A wide, flat zone of small particles around a planet's equator. |
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