What percentage of air consist of nitrogen?
78%
88%
98%
68%
What is formed when water vapor rises up in the sky?
Rain
Clouds
Breeze
Storm
Air is a mixture of many:
Gases
Dust
Germs
Vapour
How is wind produced?
When Sun rays are blocked by the clouds
When cool air rises up
When water vapor in the air rises up
When hot air rises up
Which statement is true?
Air takes up space
Air does not take space
Air does not have weight
Air cannot move things
When the wind is slow, it is called a:
Drought
Humidity
A very strong wind is called a:
Wind
Hurricane
What are the effects of air pollution?
asthma
diarrhea
eczema
hyper tension
Water vapor rises up in the sky to form: