How do mid ocean ridges form?Asked by: Wanda Marks
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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 are mid-ocean ridges formed for kids?
The mid-ocean ridge is formed where two tectonic plates meet under the ocean. This divergent boundary creates mountains, valleys like the famous rift valley, volcanoes, and sometimes earthquakes. It stretches all around the Earth, is home to many strange animals, and still has a lot to be explored.
What is a mid-oceanic ridge where is it formed give an example of one?
The Mid-Atlantic Ridge, which is spreading one to two inches a year, along with the East Pacific Rise, which is spreading two to six inches a year, are two examples of very long mid-ocean ridges.
How long are mid-ocean ridges form?
They form a rift valley system that encircles the Earth along a total length of over 75,000 km (Figure 6.11). The mid-ocean ridges are the earth's largest volcanic system, accounting for >75% of all volcanic activity on the planet.
What do you expect to find at a mid-ocean ridge?
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 volcanoes at mid-ocean ridges?
Mid-ocean ridges. The global mid-ocean ridge system is the largest single volcanic feature on the Earth, encircling it like the seams of a baseball. ... The mid-ocean ridge consists of thousands of individual volcanoes or volcanic ridge segments which periodically erupt.
Which mid-ocean ridge is spreading the slowest?
The Ridge is named after him, and the name was recognized in April 1987 by SCUFN (under that body's old name, the Sub-Committee on Geographical Names and Nomenclature of Ocean Bottom Features). The ridge is the slowest known spreading ridge on earth, with a rate of less than one centimeter per year.
What is a deep crack that runs through the center of a mid-ocean ridge?
Running along the top of this chain of mountains is a deep crack, called a rift valley. It is here that new ocean floor is continuously created. As the two sides of the mountain move away from each other, magma wells up from the Earth's interior.
Are all rocks on the Earth formed in the mid-ocean ridges?
The answer to this question is no because most of the rocks are formed because of the aggregates of the mineral. Additionally, there are few layers like bedrock lander rocks also available on the earth.
What are 5 facts about the Mid-Atlantic Ridge?
The Mid-Atlantic Ridge is the longest mountain chain on Earth. It runs along the Atlantic Ocean floor from North America to beyond the southern tip of Africa. It rises 6,000–13,000ft (2,000–4,000m) above the sea floor, and runs for 10,000 miles (16,000km). Beneath the ridge is a place of great volcanic activity.
What is a mid-ocean ridge simple definition?
: an elevated region with a central valley on an ocean floor at the boundary between two diverging tectonic plates where new crust forms from upwelling magma.
What is a Mid-Atlantic Ridge for kids?
The Mid-Atlantic Ridge is where seafloor spreading takes place in the middle of the Atlantic Ocean. It is part of a world-wide system of mid-ocean ridges. These ridges make up the longest mountain range in the world, all underwater except for short stretches like Iceland.
What two processes occur at mid-ocean ridges?
There are two processes, ridge-push and slab-pull, thought to be responsible for the spreading seen at mid-ocean ridges, and there is some uncertainty as to which is dominant. Ridge-push occurs when the weight of the ridge pushes the rest of the tectonic plate away from the ridge, often towards a subduction zone.
Where is the center of a mid ocean ridge?
The Mid-Atlantic Ridge runs down the center of the Atlantic Ocean. It spread apart at rates of 2 to 5 cm per year, and at these relatively slow spreading rates, the ridge has a deep rift valley along its crest. The rift valley is 1 to 3 km deep, about the depth and width of the Grand Canyon.
At what types of boundary do mid-ocean ridges occur quizlet?
Mid-Ocean ridges occur at divergent plate boundaries.
What happens to the rock as the seafloor spreads?
Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. ... This rock (basalt) becomes a new part of Earth's crust.
What is formed when the ocean floor moves on either side of a mid ocean ridge?
Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
What are the two main differences in shape of fast versus slow mid ocean ridges?
Fast-spreading mid-ocean ridges have an axial high (the "rise crest") whereas slow-spreading ridges have deep axial rift valleys. This difference in morphology is reflected in the ruggedness of the flanks of ridges.
What is the slowest spreading ocean?
The Gakkel Mid-Ocean Ridge (MOR) is the slowest spreading center on the planet with full-spreading rates between 1.33 cm/yr along the Greenland end to 0.63 cm/yr along the Siberian end.
What erupts through the valley of the mid ocean ridge?
What erupts through the valley of the mid ocean ridge? ... At mid ocean ridge, molten material rises from the mantle and erupts. The molten material then spreads you out, pushing older rock to both sides of the ridge.
What causes melting at mid-ocean ridges?
Melting is a primary means by which the earth cools: sea- floor spreading brings hot mantle from depth to the colder sur- face. ... As mantle ascends beneath the mid-ocean ridge, less and less rock lies above it, so large pressure changes occur, which leads to melting.
What type of ejecta is found at mid-ocean ridges?
The lava produced at the spreading centers is basalt, and is usually abbreviated MORB (for Mid-Ocean Ridge Basalt). MORB is by far the most common rock type on the Earth's surface, as the entire ocean floor consists of it.
What type of lava is most common at mid-ocean ridges?
The material that erupts at spreading centers along the mid-ocean ridge is primarily basalt, the most common rock on Earth.
What is an example of a ridge?
The definition of a ridge is a long, narrow crest of something. An example of a ridge is the strip of mountains in the Southeast area of Mt. Everest from Nepal. An example of a ridge is along an animal's backbone.