What critical role do Supernova Remnants play regarding the chemical composition of the interstellar medium?

Answer

They distribute almost all elements heavier than iron forged in the supernova explosion.

SNRs are essential for chemical enrichment by distributing newly synthesized material, especially elements heavier than iron, which were created during the explosion, into the interstellar medium for future stellar generations.

What critical role do Supernova Remnants play regarding the chemical composition of the interstellar medium?
astronomysupernovaremnants