oceanic trench

An oceanic trench is a deep, narrow depression in the ocean floor, formed where one tectonic plate is being pushed under another in a process called subduction. These trenches can be thousands of meters deep, making them some of the deepest parts of the ocean. They are often associated with volcanic activity and earthquakes. Some well-known examples include the Mariana Trench and the Tonga Trench. Oceanic trenches play a significant role in the Earth’s geological processes and are important for studying marine life and environmental changes.