CBSE Class 9 Biology Natural Resources
Natural Resource - Air
Rain is a product of the condensation of atmospheric water vapor released on the Earth's surface.
Acid rain and smog are the two major outcomes of air pollution. Global warming is the enhanced greenhouse effect.
Natural Resources - Water and Soil
Water pollution is addition of undesirable substances or removal of beneficial substances from water.
Sun, water, wind, and living organisms contribute to soil formation. Soil pollution decreases the fertility of soil.
Water Cycle includes process like Condensation, precipitation while nitrogen cycle consists of nitrogen fixation, ammonification, nitrification, and denitrification.
Carbon cycle and oxygen cycle are closely linked in nature.
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