Sphere example sentences

Plants utilise CO2 from the atmosphere for photosynthesis, thereby decreasing the amount of CO2 in the air.Troposphere is a turbulent, dusty zone containing air, much water vapour and clouds.National parks, wildlife sanctuaries, biosphere reserves are made to protect our natural vegetation and wildlife.The concentration of CO2 is very low in the atmosphere (between 0.Just as the glass in a greenhouse holds the sun's warmth inside, atmosphere traps the sun's heat near the earth's surface and keeps it warm.The increase in the greenhouse gases is raising the temperature of the earth's atmosphere which, if not checked, may eventually result in melting of polar ice caps and consequently may submerge the costal land mass.In planets such as enus and Mars, where no life is known to exist, the major component of the atmosphere is found to be carbon dioxide.Oxygen from the atmosphere is used up in three processes, namely combustion, respiration and in the formation of oxides of nitrogen.The amount of carbon present in the earth's crust and in the atmosphere is quite meagre.This carbon dioxide then goes back into the atmosphere.Human activities, thus, contribute to the accumulation of CO2 in the atmosphere.Power plants give out tiny ash particles which also pollute the atmosphere.The presence of ozone in the stratosphere prevents about 9 5 per cent of the sun's harmful ultraviolet (U ) radiations from reaching the earth's surface and thereby protecting humans and other animals from its effect.One of your observations in the above activity could be the differences in the amount of smoke in the atmosphere.Whereas stratosphere extends above troposphere up to 50 km above sea level.