Clouds and fog

This task is about water vapour in clouds and fog.
clouds
Read the information given and answer the following questions about cloud and fog.

Question 1Change answer

a)  The Earth's atmosphere is changing every day.
     Clouds are sometimes very low and other times very high above the Earth.
     What is one thing that may cause clouds to be at different heights above the same place?
     

Question

b)  The chart shows average relative humidity and wind speed for four days. Humidity is water vapour in the atmosphere.
  

Day
Relative Humidity
(Percent)
Wind Speed 
(Kilometres Per Hour)

Monday

90

20

Tuesday

95

3

Wednesday

70

2

Thursday

95

30
 
 

Fog usually occurs when the relative humidity is greater than 90% and it is calm.
On what day is fog most likely?

    • Monday

    • Tuesday

    • Wednesday

    • Thursday

Explain your answer.