Which is the first layer of the atmosphere?
Troposphere
Stratosphere
Mesosphere
Exosphere
What is atmosphere?
Mixture of gases that surrounds the earth
Mixture of gases that surrounds the sun
Mixture of gases that surrounds the moon
Mixture of gases that surrounds the planets
The mixture of gases that makes up the Earth's atmosphere is called:
Water vapour
Air
Nitrogen
Hydrogen
Jet aircrafts fly in the :
Which layer of the atmosphere contains ozone gas?
Lithosphere
Which is needed by human body to carry out life processes?
Food
Water
Pressure
Gravity
What do we need to breathe?
Inhaler
Smell
Vaporizer
Which chemical is added to water to kill germs?
Chlorine
Ammonium
Arsenic
Benzene
Removing impurities by passing water through a thin cloth or filter paper is called:
Sedimentation
Decantation
Distillation
Filtration
What is the process of purifying water by first boiling and then condensing called?