How is an oceanic ridge different from an oceanic rise?

Wiseman and Ovey (1953) present the term oceanic rise as a long and broad elevation of the deep seafloor that rises gently and smoothly, and a ridge is considered to have steeper sides and less regular topography than a rise.

What’s the difference between oceanic ridge and rise?

So, what’s the difference between a ridge and a rise? It has to do with how fast they are spreading apart. Ridges are spreading apart more slowly, and thus have steep slopes and higher elevations; Rises are spreading quickly, so have gentle slopes and are lower in elevation.

What is oceanic rise?

[‚ō·shē′an·ik ′rīz] (geology) A long, broad elevation of the bottom of the ocean.

What is an oceanic ridge?

oceanic ridge, any of several continuous submarine mountain chains rising from the ocean floor. Individually, oceanic ridges are the largest features in ocean basins.

What causes oceanic ridge rises?

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.

How is an oceanic ridge formed?

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.

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 does an oceanic crust also help in the formation of oceanic trenches?

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 is defining feature of an oceanic plate?

Oceanic plates are mafic in nature, composed of basalt rock and its coarse-grained equivalent, gabbro, both rich in iron, magnesium and calcium. In contrast, continental plates are felsic in nature, dominated by granitic rock with its abundant silica, aluminum, sodium and potassium.

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. How are they formed? They are formed in the subduction zone as the denser oceanic plate is subjected under the continental plate.

What happens at an oceanic ridge quizlet?

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.

Where are oceanic trenches formed?

Ocean trenches form on tectonic plate boundaries where the dense plate subducts below the less dense plate due to plate movement. These destructive plate boundaries result in a steep V-shaped valley or trench on the ocean floor. Ocean trenches occur in all the world’s ocean basins.

What occurs at an oceanic trench quizlet?

At a converging plate boundary, the denser oceanic plate will undergo subduction at the subduction zone, resulting in a depression aka oceanic trench. The depression maybe formed by the convergence of Two oceanic plates, of which the denser plate go through subduction. You just studied 3 terms!

How do the ocean floor features such as trenches and mid-ocean ridges form?

As plates converge, one plate may move under the other causing earthquakes, forming volcanoes, or creating deep ocean trenches. Where plates diverge from each other, molten magma flows upward between the plates, forming mid-ocean ridges, underwater volcanoes, hydrothermal vents, and new ocean floor crust.

How do ocean floor features such as trenches in mid-ocean ridges form quizlet?

How are ocean trenches created? Two oceanic plates collide at a convergent boundary. The older, denser oceanic crust subducts into the mantle.

Where are oceanic trenches found quizlet?

What are deep-ocean trenches? Long, narrow creases in the seafloor representing the deepest parts of the ocean floor. Most are located along the margins of the Pacific Ocean, with only two being located in the Atlantic.

Where is the deepest ocean quizlet?

– The Pacific Ocean is the largest ocean on Earth’s surface. With an average depth of of 4.3 km, it is also the deepest ocean. – The next largest ocean is the Atlantic Ocean.

When two oceanic plates converge some magma erupts under the ocean?

When two oceanic plates converge some magma erupts under the ocean? Seafloor spreading increases the size of the ocean basin as rifting continues. When two oceanic plates converge, some magma erupts under the ocean, forming volcanoes that may rise above the sea.

What is formed when oceanic plate converges with another oceanic plate?

When two oceanic plates collides, they will form a volcanic island arc. This also forms a subduction zone. This is happening at the Aleutian Islands close to Alaska. Boundary between tectonic plates in which the two plates move away from each other, and new crust is created between them.

What happens when two oceanic plates converge?

As with oceanic-continental convergence, when two oceanic plates converge, one is usually subducted under the other, and in the process a trench is formed. The Marianas Trench (paralleling the Mariana Islands), for example, marks where the fast-moving Pacific Plate converges against the slower moving Philippine Plate.

What happens when 2 oceanic plates converge or collide?

When two oceanic plates converge, the denser plate will end up sinking below the less dense plate, leading to the formation of an oceanic subduction zone. … Old, dense crust tends to be subducted back into the earth. An example of a subduction zone formed from a convergent boundary is the Chile-Peru trench.

What happens when an oceanic plate converges with a continental plate?

When oceanic crust converges with continental crust, the denser oceanic plate plunges beneath the continental plate. This process, called subduction, occurs at the oceanic trenches (figure 6). The entire region is known as a subduction zone. Subduction zones have a lot of intense earthquakes and volcanic eruptions.

What are the different geologic features formed when continental plate and oceanic plate collides?

Deep ocean trenches, volcanoes, island arcs, submarine mountain ranges, and fault lines are examples of features that can form along plate tectonic boundaries.