What was used in ww1 to blow up ships carrying supplies?

The Germans used torpedoes to blow up ships carrying supplies from America to Britain. The Germans torpedoed the passenger liner Lusitania on May 1st 1915 which sank with a loss of 1,195 lives. Americans were outraged and joined the war in 1917 on the side of the allies.

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Todd swam his race in 36.795 seconds while Markie swam his race in 39.09 seconds. What was the difference in their times?

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i think it's the cabinet