contrary to popular belief, BBM does not stand for 'BlackBerry Messenger'; it bears a slightly more disturbing meaning. BBM is actually short for 'Big Black Meat', or so some Twitter users seem to think (one example being @BigBlackMeatMan). The abbrevaition is almost always used with the name Darelle, for reasons unknown. One thing is for sure, and it's that this word causes great confusion in the Twitterverse.
By Jennifer Kennedy. The Mariana Trench (also called the Marianas Trench) is the deepest part of the ocean. This trench lies in an area where two of the Earth's plates-the Pacific Plate and the Philippine Plate-come together. The Pacific plate dives under the Philippine plate, which also partially gets pulled along (read more about this collision under oceanic-oceanic convergence here).
The Pacific plate is subducting beneath the Philippine Sea plate to the east while the west/northwestern part of the Philippine Sea plate is subducting beneath the continental Eurasian plate. There are shorter boundaries of the Philippine Sea plate with the Okhtosk plate to the north, and the Australian plate to the south. The relative plate motions and boundaries are all clearly depicted in Figure 1.