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.
During the 1940s and 1950s, scientists began using radar on moving ships to map large areas of the ocean floor in detail. The youngest rocks are found nearest to the mid-ocean ridges. The scientists Harry Hess invented echo-sounding devices for mapping the ocean floor. As the seafloor spreads apart, hot saltwater moves upward and flows from the cracks. As the new seafloor moves away from the ridge and becomes hotter, it moves upward and forms still higher ridges.