Expression of IdeasEasy–MediumExplaining a lower boiling point
Expression of Ideas practice question
While researching a topic, a student has taken the following notes:
- At sea level, water boils at 100°C.
- At the top of Mount Everest, water boils at about 70°C.
- Air pressure is much lower on Everest than at sea level.
- Lower air pressure lowers the boiling point of water.
The student wants to explain why water boils at a lower temperature on Everest.
Which choice most effectively uses relevant information from the notes to accomplish this goal?
- A. Because air pressure is much lower on Everest, water there boils at about 70°C instead of 100°C.Correct
- B. At sea level, water boils at 100°C.
- C. Water boils at about 70°C on Everest.
- D. Mount Everest is very high.
Answer: A. Because air pressure is much lower on Everest, water there boils at about 70°C instead of 100°C.
Cause and effect together.
Why the other answers are wrong
- B. At sea level, water boils at 100°C.
- Sea level only, no cause.
- C. Water boils at about 70°C on Everest.
- The effect without the cause.
- D. Mount Everest is very high.
- Not in the notes, and no explanation.
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