Ash from burning volcanoes, dust from storms and forest fires are the natural sources of ___ pollution.
With reference to sources of water pollution, which of the following is/are true?
1. Natural sources 2. Domestic sources 3. Agricultural sources 4. Industrial sources
Which among the following are man-made sources of air pollution? a. Burning of fire wood and dung cakes b. Forest fires c. Factories d. Power plants e. Volcanoes f. Vehicles