Introduction:
In this question, we are asked to identify the cause of pollution that is not man-made. We need to choose from the given options: A) combustion, B) industrialization, C) dust storm, and D) urbanization.
Detailed
To determine the cause of pollution that is not man-made, let's analyze each option:
A) Combustion: Combustion refers to the process of burning fossil fuels, which releases pollutants such as carbon dioxide, nitrogen oxides, and particulate matter into the atmosphere. This is a man-made activity, as it involves the use of machinery and vehicles that burn fossil fuels.
B) Industrialization: Industrialization refers to the development of industries and factories, which can lead to pollution through emissions of various pollutants, such as greenhouse gases, air pollutants, and toxic waste. This is also a man-made activity.
C) Dust Storm: Dust storms are natural phenomena that occur when strong winds lift and transport large amounts of dust particles from dry land surfaces into the atmosphere. These dust particles can contribute to air pollution, but the occurrence of dust storms itself is not man-made. Therefore, this is the correct answer, as it is the cause of pollution that is not man-made.
D) Urbanization: Urbanization refers to the growth and expansion of cities, which can lead to increased pollution due to factors such as increased energy consumption, transportation emissions, and waste production. This is a man-made activity.
Conclusion:
Among the given options, the cause of pollution that is not man-made is a dust storm (Option C). Dust storms occur naturally when strong winds lift and transport dust particles from dry land surfaces into the atmosphere.