Which of the following statements is/are correct? 1. Oceanic trenches are very significant in the study of plate movements 2. Oceanic trenches are associated with active volcanoes and strong earthquakes Select the answer using the code given below:
C. Both 1 and 2
Oceanic trenches are long, narrow topographic depressions of the sea floor and are the deepest parts of the ocean floor. They are formed at subduction zones where one tectonic plate is forced under another. These trenches are very significant in the study of plate movements because they mark the boundaries of convergent plates and provide crucial evidence for plate tectonics and sea-floor spreading. Thus, statement 1 is correct. Subduction zones, where oceanic trenches are located, are characterized by intense geological activity. The friction and melting of the subducting plate lead to the formation of active volcanic arcs (such as the Pacific Ring of Fire) and cause strong, deep-focus earthquakes (Wadati-Benioff zone). Thus, statement 2 is also correct. Both statements 1 and 2 are correct. Answer: Both 1 and 2
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