What is the approximate speed of light in a vacuum?
300,000 kilometres per second (about 3.0 × 10^8 m/s)
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General Knowledge of Pakistan
300,000 kilometres per second (about 3.0 × 10^8 m/s)
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