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Jet stream
A narrow current of strong winds high up in the Earth’s atmosphere. The jet stream directs the movement of weather patterns around the world.

Jet stream
Image courtesy University of Illinois WW2010 Project
Word of the day
Oil >> A black, thick liquid used to produce fuel. It is formed from the decayed remains of plants or animals, which break down into liquids and gases under extreme heat and pressure under the Earth’s surface. Oil is extracted from the Earth through drilling and pumping.