When a jet aircraft flies overhead on a clear day, you can see a trail of water vapour, called a contrail, in it's path. Which type of cloud does this contrail resemble?

The contrail left by a jet aircraft resembles a type of cloud called a cirrus cloud. Cirrus clouds are high-altitude clouds composed of ice crystals and appear as thin, wispy strands or patches in the sky. Contrails are formed when the hot exhaust gases from the jet engines mix with the cold air in the upper atmosphere, causing the water vapor in the exhaust to condense into ice crystals and form a visible trail.

To find this answer, you can observe the characteristics of a contrail and compare them to different types of clouds. In this case, the appearance of a long, thin trail of ice crystals is similar to cirrus clouds. Additionally, you can research the formation of contrails and their composition to understand why they resemble cirrus clouds.