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Rubric: Plate Tectonics Model Project
Rubric: Plate Tectonics Model Project

... Directions: 1. Select two of the eight topics to study from the attached list. Each topic has 2 to 4 questions that must be researched and answered in a type-written paragraph and displayed with your project. 2. Conference with your teacher to select one topic to study. ...
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Plate Tectonics and Continental Drift
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Deep Sea Drilling Project Initial Reports Volume 87
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Oceanic trench



The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the ocean floor. Oceanic trenches are a distinctive morphological feature of convergent plate boundaries, along which lithospheric plates move towards each other at rates that vary from a few mm to over ten cm per year. A trench marks the position at which the flexed, subducting slab begins to descend beneath another lithospheric slab. Trenches are generally parallel to a volcanic island arc, and about 200 km (120 mi) from a volcanic arc. Oceanic trenches typically extend 3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor. The greatest ocean depth to be sounded is in the Challenger Deep of the Mariana Trench, at a depth of 11,034 m (36,201 ft) below sea level. Oceanic lithosphere moves into trenches at a global rate of about 3 km2/yr.
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