What is an alloy?
A metallic substance composed of two or more elements, at least one of which is a metal
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General Knowledge of Pakistan
A metallic substance composed of two or more elements, at least one of which is a metal
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