Explanation: Mid ocean ridge are where new crustal material is forced to the surface. The new crustal
material is pushed apart forming two different plates moving in two different directions
. An ocean trench is where old crustal material is pushed under another plate where it is melted and turned into magma.
What is the difference between mid-ocean ridges and trenches quizlet?
What is the difference between mid-ocean ridges and trenches? Mid-ocean ridges occur at
divergent plate boundaries
. Trenches occur at convergent plate boundaries. … The deep trenches occur where one plate is being subducted under another.
How are mid-ocean ridges and trenches similar and different?
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).
Whats the difference between a trench and a ridge?
Trench: very deep, elongated cavity bordering a continent or an island arc; it forms when
one tectonic plate
slides beneath another. Ridge: underwater mountain range that criss-crosses the oceans and is formed by rising magma in a zone where two plates are moving apart.
What are the mid-ocean ridges and ocean trenches?
The oceanic lithosphere is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at ocean trenches. Two processes, ridge-push and
slab
pull, are thought to be responsible for spreading at mid-ocean ridges.
What are some examples of mid-ocean ridges?
Mid-ocean ridges are typically half a mile to six miles wide and over a mile underwater. Two of the most well-known mid-ocean ridges are
the Mid-Atlantic Ridge and the East Pacific Rise
. As you might guess, most of the Mid-Atlantic Ridge is in the Atlantic, and most of the East Pacific Rise is in the Pacific.
At what types of boundary do mid-ocean ridges occur?
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.
Are there trenches at mid-ocean ridges?
Hot material rises at mid-ocean ridges and
sinks at deep sea trenches
, which keeps the plates moving along the Earth’s surface.
What causes the formation of mid-ocean ridges?
The mid-ocean ridge is a continuous range of undersea volcanic mountains that encircles the globe almost entirely underwater. … It formed and evolves as a result of
spreading in Earth’s lithosphere—the crust and upper mantle
—at the divergent boundaries between tectonic plates.
Where do mid-ocean ridges form quizlet?
How do mid-ocean ridges form?
Underneath the ocean, deep in the earth
convection currents bring molten material up to the upper mantle. This material rises through faults (cracks) between oceanic plates that are moving away from one another.
What is deeper a trench or an oceanic ridge?
Oceanic trenches are topographic depressions of the seafloor, relatively narrow in width, but very long. These oceanographic features are the deepest parts of the ocean floor. … Oceanic trenches typically extend
3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor
.
Are there trenches at Transform?
Rotating the previous sketch to show the movement of the San Andreas fault Page 5 Not only do transform faults connect spreading ridges, but also ridges and trenches and
two trenches
.
What will be formed in ridge trench?
Ridge-trench interactions generate
distinctive igneous, metamorphic, structural and sedimentation effects
, which commonly are diachronous parallel to the trench; effects vary with plate boundary geometry and rate of migration is controlled by relative motion vectors.
Where are deep ocean trenches found?
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.
Where are the mid ocean ridges?
Mid-Atlantic Ridge, submarine ridge
lying along the north-south axis of the Atlantic Ocean
; it occupies the central part of the basin between a series of flat abyssal plains that continue to the margins of the continental coasts.
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.
