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6.3 Sun, Earth, Moon
6.3a - Earth's Properties
| Question | Answer |
|---|---|
| Water can exist in ____________ states of matter which helps to support life. | three |
| Earth's surface has mostly what state of water? | Liquid |
| Solid water on Earth's surface is mostly found where? | as polar ice caps at the north and south pole |
| The ___________ and ___________ help to shield Earth's surface from harmful solar radiation. | atmosphere and magnetic field |
| How old is Earth? | about 4.5 billion years old |
| Earth's atmosphere works with Earth's ___________ region to reduce the amount of the sun's energy arriving on Earth's surface. | magnetic |
| Earth has a protective atmosphere of gasses in the lower layer closest to earth. The predominant gasses are _____________ and ______________. | Nitrogen and oxygen |