Modern technology allows us to "see" into these deep crevices without physical entry.
: The deepest fractures on Earth occur at subduction zones, such as the Mariana Trench , where one plate slides beneath another, creating fissures that reach into the mantle. hyperdeep crack
In geology, a "crack" reaching extreme depths is known as a —a fracture in the Earth's crust where significant movement has occurred. Modern technology allows us to "see" into these
: Deep fractures in the seafloor can allow methane to escape from underground reservoirs, contributing to ocean acidification and atmospheric greenhouse gas levels. such as the Mariana Trench