who invented echo sounding devices for mapping the ocean floor
Rewrite each statement correctly on the lines provided. 1. During the 1940s and 1950s, scientists began using radar on moving ships to map large areas. of the ocean floor in detail. 2. The youngest rocks are found far from the mid-ocean ridges. 3. The scientist Henry Hess invented echo-sounding devices for mapping the ocean floor. 4. As the seafloor spreads apart, hot saltwater moves upward and flows from the cracks. 5. As the new seafloor moves away from the ridge and becomes hotter, it moves upward and. forms still higher ridges. 6.