The answer is mixture. A mixture is a substance that is composed of a combination of different elements that are not chemically combined (and can be physically separated). The troposphere is the lowest layer of the earth’s atmosphere and where the weather condition occurs. This means the air is mixed with water vapor (that form clouds) and other impurities such as dust and aerosols.
Answer: Option (c) is the correct answer.
Explanation:
Troposphere is defined as the lowest region of the atmosphere that extends from the surface of Earth to a height of 6 to 10 km, which is the the lower boundary of stratosphere.
In troposhere, the composition of air consists of nitrogen (78%), oxygen (21%), and 1% argon.
Since, all these gases are not chemically combined to each other in the air present in troposhere. Hence, this air is considered as a mixture.
As a mixture is defined as a substance which contains two or more substance physically combined to each other.
Thus, we can conclude that the air in the troposphere is a mixture.
