What statement-is true about ocean trenches?

Ocean trenches are the deepest parts of the ocean, formed by the subduction of tectonic plates. They can reach depths of over 36,000 feet, with the Mariana Trench being the deepest known trench. These areas are characterized by extreme pressure, cold temperatures, and unique ecosystems adapted to such harsh conditions. Ocean trenches also play a crucial role in the Earth's geological processes, including the recycling of oceanic crust.