Mr. Kumar noticed that the air in his city was getting dirty and dark with a lot of smoke coming from the factories nearby. What is the name of the black substance that comes out of factory smoke and makes the air dirty?
A. Oxygen
B. Vapor
C. Soot
D. Water
Answer:C
Mr. Kumar noticed that the air in his city was getting dirty and dark with a lot of smoke coming from the factories nearby. What is the name of the black substance that comes out of factory smoke and makes the air dirty?
A. Oxygen B. Vapor C. Soot D. Water
Explanation: Factory smoke can release a dark substance called soot, which is a type of particulate matter that can make the air dirty and dark. Soot is produced when fossil fuels are burned, such as in the combustion processes of factories and power plants. It can have negative health effects, especially on people with respiratory problems like asthma. Therefore, the correct answer is C. Soot.