theories on how the Mariana Trench was made?
- Anonymous1 decade agoFavorite Answer
the various layers beneath the arc measured by the precise timing arrivals from earthquakes and man-made sources. Higher velocities represent more dense material. Note that there is old ocean crust descending in the trench at the same time new crust is forming along the island arc (from deep melting of the down going plate) and in the back-arc spreading center (from extension behind the arc). Modified from Plate 2 of Fryer and Hussong (Proceedings of the Deep Sea Drilling Project, Leg 60, pp. 45-55, 1981).Source(s): The information appearing on this page was taken from an original article published by NOAA (National Oceanic and Atmospheric Administration) Magazine Online.