Why do welders have to wear a protective shield to cover their eyes?​

To protect their eyes of course

Explanation:

If they dont protect their eyes and if something gets into their eyes, they could even be at risk of losing their eyesight, and other problems could occur so its very important that they protect themselves

Protects from radiation, flying particles, debris, sparks, intense light, irritation and chemical burns

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.