Consider the following statements:
- Jet streams are strong winds blowing from west to east in the troposphere.
- Jet streams are found only in the northern hemisphere.
- Jet streams are stronger in winter than summer.
Which of the above statement/s is/are correct?
Correct answer: D
Explanation
Jet streams are fast westerly winds in the upper troposphere, so statement 1 is correct, and they're indeed stronger in winter when the temperature gradient between the equator and poles is sharper, making statement 3 correct. Statement 2 is wrong because jet streams occur in both hemispheres, not only the northern one.