What is a sentence for ocean trench?
The ocean surface level drops over a deep ocean trench, where there is less mass to attract sea water. The plate carrying the Afro-Arabian continent began to be subducted beneath the oceanic crust of the Tethys at a deep ocean trench.
What happens at a mid ocean trench?
Trenches are formed by subduction, a geophysical process in which two or more of Earth’s tectonic plates converge and the older, denser plate is pushed beneath the lighter plate and deep into the mantle, causing the seafloor and outermost crust (the lithosphere) to bend and form a steep, V-shaped depression.
What causes mid ocean trenches?
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
What is a trench and a mid ocean ridge?
A mid ocean ridge is a divergent boundary where plates are moving apart, An ocean trench is a convergent boundary where plates are moving together.
What is a sentence for Mid ocean Ridge?
Examples of mid-oceanic ridges You can help! These mid-oceanic ridges are where new sea floor is constantly created through the up welling of new basaltic magma. With new sea floor being pushed and pulled out, the older sea floor slowly slides away from the mid-oceanic ridges toward the continents.
Where is one example of a deep ocean trench?
Location of Ocean Trenches The Challenger Deep, the deepest part of the ocean, is found in the Pacific Ocean near Guam. The deepest valley on Earth is an ocean trench called the Challenger Deep, which is part of the Mariana Trench in the Pacific near Guam.
What is the role of mid-ocean ridge in seafloor spreading?
Sea-floor spreading is what happens at the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor. As the plates move apart, new material wells up and cools onto the edge of the plates.
How does a mid-ocean ridge form?
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. …
How were the mid-ocean ridges discovered?
However, as surveys of the ocean floor continued around the world, it was discovered that every ocean contains parts of the mid-ocean ridge system. The German Meteor expedition traced the mid-ocean ridge from the South Atlantic into the Indian Ocean early in the twentieth century.
Does mid-ocean ridge have trenches?
Rapidly spreading ridges have a much more gentle slopes. The Mid-Atlantic Ridge, for instance, is a slow spreading center. It spreads 2-5 centimeters (. 8-2 inches) every year and forms an ocean trench about the size of the Grand Canyon.
Is the Mariana Trench a mid-ocean ridge?
One reason the Mariana Trench is so deep, he added, is because the western Pacific is home to some of the oldest seafloor in the world—about 180 million years old. Seafloor is formed as lava at mid-ocean ridges. Mariana Trench Could Trigger Big Quakes?