Que: What is the contribution of carbon dioxide to the atmosphere?
Answer: Carbon dioxide is used by plants in photosynthesis, but it is also found in fire extinguishers and soft drinks.
Que: What percentage is Argon in the atmosphere?
Answer: Earth’s atmosphere is composed of about 0.93% argon.
Que: Name some small gases present in the atmosphere.
Answer: Trace gases (hydrogen, helium, methane and water vapor) make up about 0.03% of the atmosphere.
Que: What are some common daily uses of air pressure?
Answer: Air pressure is used to inflate tyres, play wind instruments, fill syringes and propel boats, windmills and kites. It is also used in inflating balloons.
Que: How much of the Earth’s surface is covered with water?
Answer: Water covers about 75% of the Earth’s surface.
Que: What is the state of the water in the Antarctic and Arctic regions?
Answer: Ice in the form of water is present in the Arctic and Antarctic regions.
Que: When the sun’s heat changes water into vapor, what is the process called?
A: Evaporation is the process by which the heat of the sun changes water into vapor.
