Philippine Trench, also called Philippine Deep, Mindanao Trench, or Mindanao Deep, is a submarine trench in the floor of the Philippine Sea of the western North Pacific Ocean bordering the east coast of the island of Mindanao. The abyss, which reaches the second greatest depth known in any ocean, was first plumbed in 1927 by the German ship Emden and found to have a depth of 34,440 feet (10,497 meters). How was this trench is formed?

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