Question

Which of the following best describes how the jet stream is formed?

Cool air moves over the warm ocean
Two cool air masses come into contact
Two air masses that have different temperatures come into contact
The moon's gravitational pull

Answer 1

When the wind "tries" to flow from high pressure to low pressure, the jet stream flows around the air masses rather than into each other. 

Answer 2

Two air masses that have different temperatures come into contact