NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Mariana Trench. Bathymetric map showing the varying depths of the Mariana Trench in the Pacific Ocean. Depths are reflected by shades of blue, with the deepest reaches represented by the darkest blues. The Mariana trench is the deepest point on Earth. This map was compiled from August to October 2010, using multi-beam echo sounders mounted on the hulls of ships. These instruments send pulsed sound waves towards the seafloor and then record the echo-like reflections. Multi-beam sounders send those pulses out in a fan-shape, allowing researchers to form three-dimensional images of the bottom.
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