Submarines+and+the+Ocean

=Submarines and Ocean Research by Mary Sine = =

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whose is this???? Put a name on it so I can grade!!! Add a little more content and add places where the pictures were obtained and I will grade again.

Submarines were first used for warfare in America during the Civil War even though they were not very successful. Submarines were used again in the first world war primarily in the Atlantic Ocean. Germany used submarines to sink merchant ships that were supplying Great Britain. In World War 2 submarines were primarily used in the Atlantic Ocean and the Pacific Ocean. In the Atlantic, Germany used submarines for covert operations and to attack supply ships headed for Great Britain and other Allied Powers in Europe. But in the Pacific, American submarines were attacking Japanese merchant ships.

During World War 2, countries started to use SONAR, which stands for SOund Navigation And Ranging, to find submarines in the ocean. The invention of SONAR changed the way submarines traveled and worked somewhat. After World War 2 was over the Navy used submarines and SONAR technology to map the ocean floor. Nobody had ever been able to fully map the ocean floor before, and this changed views on ocean geography. The maps revealed that at mid-ocean ridges, magma comes up to the crust causing the seafloor to spread. Harry Hess, a Princeton geologist, proposed the theory in the 1960s. This theory supported Alfred Wegener's theory of continental drift. These two theories combine to form and support the theory of plate tectonics. Sites Used: http://en.wikipedia.org/wiki/Submarines http://en.wikipedia.org/wiki/Sonar http://www.ucmp.berkeley.edu/fosrec/Metzger3.html