QUESTION TEXT: The axis of Earth's daily rotation is…
QUESTION TYPE: Must Be True
FACTS:
- Earth is tilted at 23 degrees.
- It can stay tilted at that degree thanks to the moon.
- Without a stable tilt, a planet can’t support life. The climate becomes extreme and unstable.
- Mars has smaller moons and no stable tilt. Mars can’t support life.
ANALYSIS: We can conclude that the moon is essential to life on earth.
___________
- A moon seems to be a necessary conditions for life. But it’s not a sufficient conditions. Mars might also need to be closer to the Sun, for example.
- CORRECT. This is well supported. If the moon left, Earth’s tilt would become unstable. That would make our climate extreme and chaotic, and we would die.
- This makes the same as mistake as A. Having a stable tilt is a necessary condition, but not a sufficient condition for life. A stable planet might be too small, or cold to support life, or the planet might lack an atmosphere.
- This is silly. Everyone knows the earth orbits the sun, thanks to gravity. That almost certainly affects our degree of tilt.
- Mars’ problem is that it’s moons are too small. It’s possible a planet with two larger moons could have a stable tilt, as well as other conditions sufficient to allow life.
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