Environmental Sciences: Green House Effect and Acid Rain
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acid rain
CLASS 8 Chapter 6 Combustion and Flame
Short answer type questions Question 1. What do you mean by the term combustion? Question 2. Why food is known as the fuel for our body? Question 3. What is Ignition temperature? Question 4. What are inflammable substances? Give two examples. Question 5. Why CO2 is considered the best extinguisher for electrical equipment and
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CLASS 8 Chapter 18 Pollution of Air and Water
Question 1. What are the different ways in which water gets contaminated? Solution 1. Following are the different ways in which water gets contaminated: i)Industrial waste: Industries releases harmful chemicals into water sources. ii) Sewage waste: The waste materials released from the kitchen, laundry and toilets pollute water. iii) Agricultural chemicals: Rains and floods carry these harmful
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