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What are the conditions that cause hail to fall?

Hail forms in strong thunderstorm, when strong currents of rising air (updrafts) they carry droplets of water high enough that they freeze..

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