Final answer:
Jet streams are rapidly moving air streams in the lower part of the atmosphere. They form when cold and warm air masses meet. They can reach speeds of more than 160 kilometers per hour and play a crucial role in influencing weather patterns.
Step-by-step explanation:
True
Jet streams are rapidly moving air streams in the lower part of the atmosphere that form when cold and warm air masses meet. These high-speed winds are typically found in the upper troposphere and lower stratosphere and can reach speeds of more than 160 kilometers per hour. Jet streams play a crucial role in influencing weather patterns and are important in aviation for determining flight routes and travel times.