Oceanic Trenches
The low parts of the ocean floor, it is marked when there are some parties in the ocean next to the continents and often separated from the continents brackets Islands Island Arcs any group of islands in the form of an arc and then spoke of earthquakes and volcanic activity are examples of the trenches associated with those islands in Indonesia.
There beneath the basalt rocks and Kagabro Alserbntinett. Above the basalt layer and a thin crust of the ocean sediments. And limiting the age of ocean sediments by examining the content of fossil could be reached that the oldest of these sediments is the farthest from a single mid-ocean sediment, while the latest are those near the torus. The discovery of strong evidence for the theory of the spread of the ocean floor .
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