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1. 
How is a cloud formed?
A.
Clouds form when the water droplets join together.
B.
Clouds form when air that is charged with water vapour rises, cools and condenses aroud tiny dust particles, salt or ash.
C.
Clouds form when the temperature reaches 0ºC.
D.
Clouds form when there are strong rising air currents.
2. 
When does the rain occurs?
A.
When the water droplets in a cloud join together. When they are big enough, gravity makes them fall.
B.
When the temperature inside a cloud reaches 0ºC. The water droplets freeze and they fall from the cloud when they are heavy enough.
C.
When there are strong rising air currents inside the cloud which deep freeze the water droplets (-50ºC).
D.
When the temperature of the Earth's surface is below 0ºC and water vapour freezes.
3. 
What is fog?
A.
It is a cloud charged with water vapour.
B.
It forms when the temperature of the Earth's surface is below 0ºC and water vapour freezes.
C.
It is a cloud that reaches 0ºC inside. The water droplets freeze and produce the fog.
D.
It is a low cloud that forms close to the ground. This occurs when the air on the ground cools down but does not go below 0ºC.
4. 
What is snow?
A.
When the water droplets in a cloud join together. When they are big enough, gravity makes them fall.
B.
When there are strong rising air currents inside the cloud which deep freeze the water droplets (-50ºC).
C.
When the temperature inside a cloud reaches 0ºC. The water droplets freeze and they fall from the cloud when they are heavy enough.
D.
When the temperature of the Earth's surface is below 0ºC and water vapour freezes.
5. 
What is frost?
A.
When the temperature of the Earth's surface is below 0ºC and water vapour freezes.
B.
When the temperature inside a cloud reaches 0ºC. The water droplets freeze and they fall from the cloud when they are heavy enough.
C.
When there are strong rising air currents inside the cloud which deep freeze the water droplets (-50ºC).
D.
When the water droplets in a cloud join together. When they are big enough, gravity makes them fall.
6. 
What is dew?
A.
It is a low cloud that forms close to the ground. This occurs when the air on the ground cools down but does not go below 0ºC.
B.
When air that is charged with water vapour rises, cools and condenses aroud tiny dust particles, salt or ash.
C.
When the temperature inside a cloud reaches 0ºC. The water droplets freeze and they fall from the cloud when they are heavy enough.
D.
It is condensed water vapour. This occurs during the night when temperatures drop.
7. 
What is Hail?
A.
When the temperature of the Earth's surface is below 0ºC and water vapour freezes.
B.
It is condensed water vapour. This occurs during the night when temperatures drop.
C.
When there are strong rising air currents inside the cloud which deep freeze the water droplets (-50ºC).
D.
It is a low cloud that forms close to the ground. This occurs when the air on the ground cools down but does not go below 0ºC.