Clouds

How are clouds formed?

• By the freezing of water droplets in the atmosphere

• By the evaporation of water from the ground

• By the condensation of water droplets or ice crystals in the air

• By the melting of ice crystals in the air

What determines the classification of clouds?

• Where they are formed

• Their color

• Their shape

• Their size

What happens when the air inside a cloud cools down?

• It starts to rain

• It starts to snow

• The cloud gets bigger

• The cloud disappears

 Why can clouds float in the air?

•  Because they are made of water vapor

• Because they are lighter than air

• Because they are formed by the wind

• Because they are filled with helium

What causes clouds to move?

• The sun's heat

• Rainfall

• The wind

• The rotation of the Earth

Which type of cloud is usually formed at higher altitudes?

• Cumulus clouds

• Low clouds

• High clouds

• Middle clouds

What is the average speed at which clouds in a thunderstorm travel?

• 10 to 20 miles per hour

• 70 to 80 miles per hour

• 50 to 60 miles per hour

• 30 to 40 miles per hour

What happens when warm air cools down inside a cloud?

• The cloud starts to rain

• The cloud gets smaller

• The cloud moves faster

• The cloud disappears

 How are clouds different from fog?

• Fog is formed by evaporation, while clouds are formed by condensation

• Fog is always closer to the ground than clouds

• Fog is thicker and denser than clouds

•  All of these

Which statement is true about clouds?

• Clouds can take different shapes and sizes

• Clouds are made of tiny pieces of cotton

• Clouds can only form during the day

• Clouds are always white in color