Thermosetting plastics cannot be used again. why

Thermosetting plastic molecules, on the other hand, form permanent chemical bonds or cross links with each other once heated. ... Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. An excellent example is polyurethane foam

Explanation:

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.