What can be learned from using sonar in an ocean environment

Using sonar in an ocean environment, you can determine how far below you are from reaching the bottom, or if something bigger picks up, say a whale, which in turns lets you know something big is beneath you. It helps determine how far you are under the water as well.

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.

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