AP Environmental Science

Answer: D - The jet stream is the narrow band of high-speed winds that blow in the lower stratosphere and troposphere and are used by airline pilots to accelerate plane trips.

Key Takeaway: Several different winds are found on the Earth. One type is the jet stream. The jet stream is a very narrow band of high-speed wind. These winds in the lower stratosphere and the troposphere can reach speeds of 400 km/hour, making them very useful for airline pilots looking to accelerate their plane trips. Meteorologists also monitor the jet stream to look for cold or warm fronts and to follow major storms.