14. Distinguish between speed and velocity.
16. List any two Human activities that can lead to air Pollution.
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16 . A : Human activity is a major cause of air pollution, especially in large cities. Human air pollution is caused by things such as factories, power plants, cars, airplanes, chemicals, fumes from spray cans, and methane gas from landfills. One of the ways that humans cause the most air pollution is by burning fossil fuels.
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