Earth - Earth
Earth (30) Add new question
Question
Q: what do you know about Earth?
| Option | Answer | Is Correct |
|---|---|---|
| 1 | Earth (1 AU) is the largest and densest of the inner planets, and the only one known to have current geological activity. Earth is the only planet known to have life; it is from here that the human race observes the universe around it. Its liquid hydrosphere, unique among the terrestrial planets, is probably the reason Earth is also the only planet where plate tectonics has been observed, because water acts as a lubricant for subduction. Earth’s atmosphere is radically different from the other terrestrial planets, having been altered by the presence of life to contain 21 percent free oxygen.Earth has one satellite, the Moon; the only large satellite of a terrestrial planet in the Solar System. |
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