Why do Planes Leave White Streaks in the Sky?

What are clouds and the trails from airplanes mostly made of?

• Dirt

• Smoke

• Water

• Air

What do jet engines let out when they burn fuel?

• Fuel

• Exhaust

• Air

• Smoke

What happens to water vapor when it touches something cold?

• It disappears

• It turns into tiny water droplets or ice

• It gets hotter

• It becomes invisible

Why do jet planes leave white trails high in the sky?

• The plane is burning extra fuel

• The air is very warm, making the vapor visible

• Cold air turns the water vapor from the engine into tiny drops of water or ice

• The plane is releasing special smoke for fun