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How do we know that Mariana trench is the deepest?

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The Challenger Deep is the lowest point in the Mariana Trench, a gap between tectonic plates that stretches 1,500 miles along the western Pacific, and is thought to be the deepest chasm in all the world's oceans. At the bottom the pressure reaches over 15,000 pounds per square inch. read more

That said, the discovery of a new"deepest point" (i.e. the deepest known point), in the Mariana Trench in 2012 illustrates that high-resolution mapping has yet to pinpoint the exact location of the ocean's deepest point. read more

The Mariana Trench, in the Pacific Ocean, is the deepest location on Earth. According to the Exclusive Economic Zone (EEZ), the United States has jurisdiction over the trench and its resources. Scientists use a variety of technologies to overcome the challenges of deep-sea exploration and explore the Trench. read more

The Challenger Deep, in the southern end of the Mariana Trench (sometimes called the Marianas Trench), is the deepest spot in the ocean. Its depth is difficult to measure from the surface, but modern estimates vary by less than 1,000 feet (305 meters). read more

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