Geography of Greece. It is a peninsular and mountainous country located in Southern-Eastern Europe, in the Balkans peninsula. The country has the largest coastline in Europe (13,676km) due to its numerous islands. Greece has a total of 2,000 Greek islands but only 168 are inhabited.
Harry Hess created the theory of plate tectonics moving along the ocean's floor.
I think that Henry Hess invented echo-sounding devices for mapping the ocean floor. But I am not 100% sure that is the correct answer. LOL <3. I think that Henry Hess invented echo-sounding devices for mapping the ocean floor. But I am not 100% sure that is the correct answer.  LOL &lt;3.