A Deep Sea Trench is a narrow, steep-sided depression in the ocean floor, formed by tectonic plate movements. These trenches are the deepest parts of the ocean, with some, like the Mariana Trench, reaching depths of over 36,000 feet. They play a crucial role in the Earth's geology and are often associated with subduction zones, where one tectonic plate moves under another. Deep sea trenches are home to unique ecosystems, hosting organisms that can withstand extreme pressure and darkness. The extreme conditions in these trenches, such as cold temperatures and high pressure, have led to the evolution of specialized species, including certain types of fish and microorganisms.