Scientists Have Mapped the Seafloor Using Gravity

From Mental_Floss by Shaunacy Ferro:

“The topography of the ocean floor is as varied as topography on land. There are mountains and canyons, gently sloping hills and sharp cliffs. But where? Satellite maps can’t show variations in the ocean floor that lie under hundreds of meters of water, and only five to 15 percent of the ocean floor has been mapped by sonar. Gravity, however, can.”

http://mentalfloss.com/article/73713/scientists-have-mapped-seafloor-using-gravity

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