Geography
Assertion (A): The earth is the only planet known to support life.
Reason (R): The earth is a terrestrial planet like Mercury and Venus.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R does not explain A.
- A is true but R is false.
- A is false but R is true.
Planet Earth
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Answer
Both A and R are true but R does not explain A.
Explanation — Earth supports life mainly because of its liquid water, protective atmosphere, and moderate temperature range. Merely being a terrestrial (rocky) planet, like Mercury and Venus, is not enough, those planets lack the life-supporting conditions that Earth has.
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Related Questions
Assertion (A): Water on earth drastically tones down day and night temperature variation.
Reason (R): Water can absorb enormous amount of heat without causing much change in its temperature.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R does not explain A.
- A is true but R is false.
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Name the gas that absorbs the harmful ultraviolet rays of the sun.
- Ozone
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Assertion (A): Earth is a watery planet that supports life.
Reason (R): Distribution of water is responsible for moderating the surface condition of the earth.
- Both A and R are true and R is the correct explanation of A.
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- A is true but R is false.
- A is false but R is true.
Earth has a very hospitable temperature and mix of chemicals that have made life abundant here. Most notably, earth is unique in that most of our planet is covered in liquid water, since the temperature allows liquid water to exist for extended periods of time. Besides liquid water and temperature identify the other features of our planet that make it great for sustaining life?
- Presence of an atmosphere
- Solid crust
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- All of the above.