What is convection?
Transfer of heat by the bulk movement of a fluid such as a liquid or gas
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General Knowledge of Pakistan
Transfer of heat by the bulk movement of a fluid such as a liquid or gas
The controlled biological decomposition of organic materials into a nutrient-rich soil amendment
Nitrogen and phosphorus
Excessive nutrient enrichment of water that can cause algal growth and oxygen depletion
It absorbs most of the Sun's harmful ultraviolet-B radiation