question_answer1) Nitrogen helps in maintaining the soil fertility.
question_answer2) Increase in the level of carbon dioxide causes pollution.
question_answer3) 70 percent of the earth?s total area is land.
question_answer4) Forests cause global warming.
question_answer5) Plants produce carbon dioxide and absorb oxygen.
question_answer6) Deforestation causes floods.
question_answer7) Planting trees helps to conserve the natural environment.
question_answer8) Water is a biotic element of the physical environment.
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