What are ocean trenches
How are ocean trenches formed?
In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.
How are ocean trenches formed quizlet?
Ocean trenches are deep sections of the ocean where an oceanic plate is usually sinking below a continental plate. ... They are formed in the subduction zone as the denser oceanic plate is subjected under the continental plate .
How did the Mariana Trench form quizlet?
Mariana Trench is formed as the pacific plate subducts beneath the smaller, less dense Philippine plate .
Where do ocean trenches occur?
Ocean trenches are found in every ocean basin on the planet , although the deepest ocean trenches ring the Pacific as part of the so-called “Ring of Fire” that also includes active volcanoes and earthquake zones. Ocean trenches are a result of tectonic activity, which describes the movement of the Earth’s lithosphere.
What causes deep trenches quizlet?
Ocean trenches are deep sections of the ocean where an oceanic plate is usually sinking below a continental plate . ... They are formed in the subduction zone as the denser oceanic plate is subjected under the continental plate.
Where do deep-ocean trenches occur quizlet?
Where does a Deep-Ocean Trench occur? A convergent plate boundary where one continental plate and one oceanic plate collide .
How are mid-ocean ridges and trenches similar?
Mid-ocean ridges are areas of rifting where two tectonic plates are diverging from one another. Magma rises up through the rifts and forms mountain ranges. ... Deep-ocean trenches are formed at convergent plate boundaries where the more dense plate (usually the oceanic) subducts under the less dense (usually continental).
What is the Mariana Trench quizlet?
MARIANAS TRENCH. Deepest portion of world’s oceans located in the Western Pacific . This is location where floor of Pacific Ocean descends back into the Earth. The deepest portion of this area is called the Challenger Deep
What happens to oceanic crust at a deep-ocean trench quizlet?
What happens to oceanic crust at a deep-ocean trench? At a deep-ocean trench, the oceanic crust bends downward . In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.
What are examples of ocean trenches?
Ocean trenches exist in all the world’s oceans. They include the Philippine Trench, Tonga Trench , the South Sandwich Trench, the Eurasian Basin and Malloy Deep, the Diamantina Trench, the Puerto Rican Trench, and the Mariana.
Why are most trenches found in the Pacific Ocean?
Why are most oceanic trenches found in the Pacific Ocean? The Pacific Ocean is shrinking and plates are descending below surrounding plates along its edges , hence the creation of trenches.
Where are the deepest parts of the seafloor?
The deepest part of the ocean is called the Challenger Deep
Which type of zone is located at a deep ocean trench quizlet?
Located along convergent plate boundaries, these are active subduction zones . Deep sea trenches are the major topographic expression of convergent plate boundaries, surrounding most of the Pacific Rim.
Where do mid-ocean ridges and ocean trenches form?
Mid-ocean ridges occur along divergent plate boundaries , where new ocean floor is created as the Earth’s tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.
