Jet stream is described as a high-velocity wind near the upper troposphere that generally flows from west to east. This describes which option best?

• A. It is a low-altitude wind.
• B. It is a wind of uniform speed.
• C. It is a wide, slow-moving wind at mid-troposphere.
• D. It is a high-velocity wind near the upper troposphere that generally flows from west to east.

Answer: (D)

Jet streams are high-velocity winds that occur in the upper part of the troposphere, near the tropopause, and they generally blow from west to east. This description matches the jet stream’s defining characteristics: they are fast winds found at upper levels of the atmosphere, not near the surface, and their dominant flow direction in both hemispheres is from west to east, though they can meander. The other statements describe winds at low altitude, with uniform speed, or slow winds in the mid-troposphere, which don’t fit the jet stream’s typical location, variability in speed, or preferred direction.