Mid-ocean ridges are places where tectonic plates are doing what?

What is the function of the Mid Oceanic Ridge?

Midocean ridges represent one of the most important geologic processes shaping the Earth: Over the last 200 million years, two-thirds of the Earth has been resurfaced through this process of seafloor spreading, either at conventional midocean ridge spreading centers or at spreading centers in back-arc basins behind

How does the Mid Atlantic Ridge support the theory of plate tectonics?

Mantle convection drives plate tectonics. Hot material rises at mid-ocean ridges and sinks at deep sea trenches, which keeps the plates moving along the Earth’s surface. The outer limbs of the convection cells plunge down into the deeper mantle, dragging oceanic crust as well. This takes place at the deep sea trenches.

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What is the role of the mid ocean ridge in the movement of lithospheric plates?

The midocean ridge represents an area where, in accordance with plate tectonic theory, lithospheric plates (also called tectonic plates) move apart and new crust is created by magma (molten rock) pushing up from the mantle.

What causes tectonic plates to move away from each other at the Mid Ocean Ridge?

As the two move apart, midocean ridges are created as magma from the mantle upwells through a crack in the oceanic crust and cools. These continual convection currents, called convection cells, help to move the plates away from each other to allow more crust to be created and the sea floor to grow.

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 happens when two oceanic plates collide?

A subduction zone is also generated when two oceanic plates collide — the older plate is forced under the younger one — and it leads to the formation of chains of volcanic islands known as island arcs.

What is the Mid Atlantic Ridge and why is it important?

Mid-ocean ridges are geologically important because they occur along the kind of plate boundary where new ocean floor is created as the plates spread apart. Thus the mid-ocean ridge is also known as a “spreading center” or a “divergent plate boundary.” The plates spread apart at rates of 1 cm to 20 cm per year.

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How many tectonic plates are there?

how many tectonic plates are there? There are major, minor and micro tectonic plates. There are seven major plates: African, Antarctic, Eurasian, Indo-Australian, North American, Pacific and South American.

Why do tectonic plates move?

The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other. This movement is called plate motion, or tectonic shift.

What are some examples of mid-ocean ridges?

List of midocean ridges

  • Kolbeinsey Ridge – A segment of the Mid-Atlantic Ridge north of Iceland in the Arctic Ocean.
  • Mohns Ridge.
  • Knipovich Ridge (between Greenland and Spitsbergen)
  • Reykjanes Ridge (south of Iceland)

What is the border between two tectonic plates called?

The border between two tectonic plates is called a boundary. All the tectonic plates are constantly moving — very slowly — around the planet, but in many different directions. Some are moving toward each other, some are moving apart, and some are sliding past each other.

What are the evidence of seafloor spreading?

Abundant evidence supports the major contentions of the seafloorspreading theory. First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.

What happens when tectonic plates move?

When the plates move they collide or spread apart allowing the very hot molten material called lava to escape from the mantle. When collisions occur they produce mountains, deep underwater valleys called trenches, and volcanoes. The Earth is producing “new” crust where two plates are diverging or spreading apart.

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What are the two main factors of tectonic plates movement?

Heat and gravity are fundamental to the process

The energy source for plate tectonics is Earth’s internal heat while the forces moving the plates are the “ridge push” and “slab pull” gravity forces.

What would happen if tectonic plates continue to move?

Plate tectonics moves the continents around on a scale of 100s of millions of year. Plate tectonics also has an impact on longer-term climate patterns and these will change over time. It also changes ocean current patterns, heat distribution over the planet, and the evolution and speciation of animals.

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