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IMSO 2008 Science Taiwan Second Round Theory I Question 1

IMSO Science · IMSO 2008 Science Taiwan Second Round Theory I

Question 1

Section A: choose the correct answer. The supplied key prints 2 points per question and 50 minutes. Source header says Qualifying Examinations; key says Taiwan (2).

What is the principal reason that air pressure at the top of a mountain is smaller than at the bottom?
  1. The air is cooler at the top.
  2. The weight of all the air above the top is smaller.
  3. The percentage of oxygen is lower at the top.
  4. The air molecules are closer together at the top.