Roots grow into cracks and rocks and break them apart. This is an example of what type of weathering? Rust occurs when iron chemically reacts with oxygen. what type of weathering is this an example of?

drfgt dfs f grftsrh fg rts gh   htr hr rs t

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.