Answer & Solution
The correct answer is “(A) is false, but (R) is true”.
Jet streams are bands of strong wind that generally blow from west to east all across the globe. They impact weather, air travel and many other things that take place in our atmosphere.
Earth has four primary jet streams: two polar jet streams, near the north and south poles, and two subtropical jet streams closer to the equator.
The discovery of the jet stream can be traced back to the explosion of Krakatoa volcano in 1883. Many sources credit real understanding of the nature of jet streams to regular and repeated flight-path traversals during World War II.
Their speeds usually range from 129 to 225 kilometers per hour, but they can reach more than 443 kilometers per hour.