CBSE Class 9 Biology Natural Resources
Natural Resource - AirAir is a mixture of gases. Movement of air is caused by the uneven heating of the atmosphere is called wind.
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 SoilWater is involved in all bodily functions such as digestion, assimilation, excretion, and respiration.
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.
Biogeochemical CyclesCyclic flow of nutrients between the abiotic and biotic components of biosphere is known as biogeochemical cycle.
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.