Which statements about Earth’s atmosphere are correct?
A)The most abundant gas in the atmosphere is oxygen.
B)Carbon dioxide in the atmosphere is important for plants.
C)The troposphere shields Earth from chunks of rock from space.
D)The stratosphere is located 50 to 80 kilometers from Earth’s surface.
E)The troposphere gets colder the higher you go.
F)The ozone in the stratosphere protects us from ultraviolet radiation.
G)The amount of water vapor in the air is nearly constant.
Answers
Answer:
Option B, E and F are correct.
Justification:
A) The most abundant gas in the atmosphere is Nitrogen(78%) whereas oxygen attributes 21% of Earth's atmosphere.
B) Carbon dioxide in the atmosphere is important for plants because it is an essential component in photosynthesis which in turn is helpful for plant growth.
C) It is the Ionosphere which protects Earth from meteorites as it has large concentration of ionised particles which increases the temperature of this layer.
D) The stratosphere is located 16km to 50km from Earth's surface.
E) At every rise of 165m, there is drop of 1°C, which makes troposphere colder as we rise. This is caleed Normal Lapse Rate of Temperature.
F) Stratosphere consists of a thin layer concentrated with ozone known as ozonosphere. This layer absorbs all the ultraviolet radiation coming from the sun.Thus, protects us from ultraviolet radiation.
G) No, the amount of water vapour does not remain constant in the atmosphere as concentration of water vapour depends on temperature, altitude and available water bodies which are not same for every place on earth. So, water vapour presents in the Earth's atmosphere in variable amount.