How does the mid-ocean ridge create new sea floor?
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.
What is the relationship between seafloor spreading and sea level and why?
The increased rate of seafloor spreading caused sea level to rise. Increasing the rate of seafloor spreading inflates the ridge. Hot, young lithosphere is forming and moving away from the ridge at a faster rate and moves a greater distance from the ridge before it cools and contracts.
How are mid-ocean ridges and subduction related?
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. 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. At the subduction zone, “slab-pull” comes into effect.
How is the sea floor formed?
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 are new ocean floors formed?
Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. At a spreading center, basaltic magma rises up the fractures and cools on the ocean floor to form new seabed.
What is the relationship between seafloor spreading and sea level?
Mid-ocean ridges and seafloor spreading can also influence sea levels. As oceanic crust moves away from the shallow mid-ocean ridges, it cools and sinks as it becomes more dense. This increases the volume of the ocean basin and decreases the sea level.
How seafloor spreading occurs in the mid-ocean ridge and the formation of the new oceanic crust?
At mid-ocean ridges, tectonic plates move apart and seafloor spreading occurs. It then cools and solidifies in the center of the ridge. The rising magma pushes up between the plates and drives them further apart. As new crust is forming at the spreading center, it pushes the older crust apart.
How does ocean crust form along a mid-ocean ridge?
How does crust form along a mid-ocean ridge? Mid-ocean ridges are formed by magma from the mantle rising to the surface at the ridge, solidifies to form oceanic crust then moves laterally away from the ridge. Because of subduction all ocean floor is less than 200 million years old.
What is formed when the ocean floor moves on either side of a mid-ocean ridge?
Seafloor spreading or Seafloor spread 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.
How do ocean ridges and deep sea trenches support the theory of seafloor spreading?
New crust can be observed being formed on the sea floor ridges. Matching magnetic lines of reversal along both sides of the ocean ridge also lends support to the theory of sea floor spreading. The subduction zones which form the deep sea trenches also support the theory of sea floor spreading.
How does the sea floor spread?
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. The less-dense material rises, often forming a mountain or elevated area of the seafloor. Eventually, the crust cracks.