essential for life:air and water

How much layers are there in atmosphere

• 5

• 8

• 15

• 30

thermosphere has how much km

which gas has the most percent of gas ?

• nitrogen

• oxygen

• other gases

in total how much removal of impurities from water (methods)?

• 3

• 2

• 5

• 63

is distilation a method of removing soulubale impurities?

• yes

• no

which gas is neccary for burning?

• nitrogen

• oxygen

• carbon dioxide

air consits of about ............. % of nitrogen

removal of impurities with the help of a filter papper

• filtration

• distilation

• decantation

atmospheric pressure is measured with an instrament called.............

• barometer

• seismometer

• sphygmomanometer

how much % of oxygen