The percentage of oxygen in the air is about
10%
21%
31%
41%
Wind pushes the water in the rivers and the sea, and causes
breeze
waves
Tsunami
cyclones
We must breathe _________ for health.
clean and fresh air
air
dust
impure
While sleeping we should keep our face
covered
partially covered
uncovered
none
What can uproot trees and, at sea it can sink ships?
Storm
Weather
Cloud
When air moves fast it is called
Breeze
Tornado
Wind
Tide
What keeps our body strong and fit?
exercise
sleep
eating
What makes the air fresh and pure?
Animals
Humans
Plants
Birds
What are the things from factories and vehicles makes the air impure?
smoke
water
solid waste
Impure air harms
Lungs
Eyes
Hands
Ears