What Process In Earth’s Interior Causes Subduction And Seafloor Spreading?
Seafloor spreading and other tectonic activity processes are the result of mantle convection. Mantle convection is the slow churning motion of Earth’s mantle. Convection currents carry heat from the lower mantle and core to the lithosphere.Jun 8 2015
What process in Earth’s interior causes subduction and seafloor spreading quizlet?
What happens to old oceanic crust as new molten material rises from the mantle? … What process in Earth’s interior causes subduction and sea floor spreading? convection currents. What effect does subduction and sea floor spreading have on Earth’s surface?
What are the steps in the process of seafloor spreading?
- Magma comes out of the rift valley.
- Magma cools to rock and hardens.
- Rock is pushed away as new rock is formed at MOR.
- Oceanic crust and continental crust meet at the trench.
- Oceanic crust bends down under the continental crust.
- Gravity pulls rock towards mantle.
- Rock melts to mantle.
What does seafloor spreading is a process of plate tectonics mean?
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.
What causes the seafloor to spread quizlet?
During sea-floor spreading magma erupts along a mid-ocean ridge to form new oceanic lithosphere. The floor then moves away from the ridge often toward a trench at the edge of the ocean basin. … The pattern shows that ocean floor forms along mid-ocean ridges and then moves away from the ridge.
What does seafloor spreading produce?
Seafloor spreading takes place at midocean ridges and produces basalt the rock that makes up the oceanic crust. The Mid-Atlantic Ridge and East Pacific Rise are examples of midocean ridges.
What is the process by which the ocean floor sinks into the mantle?
Subduction is the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle.
What is the process subduction?
What’s the first step of seafloor spreading?
1. A long crack in the oceanic crust forms at a mid ocean ridge. 2. Molten material rises and erupts along the ridge.
What causes tectonic plates to move?
How seafloor spreading occurs in the mid-ocean ridge and the formation of the new oceanic crust?
In which Earth layer are most convection currents that cause seafloor spreading thought to be located?
What does the center of the slit in the seafloor spreading model represent what process occurs in this region?
The center slit represents a Mid-Ocean Ridge 2. The strips of paper represent oceanic crust or seafloor. … Seafloor spreading is the creation of new seafloor or new oceanic crust 5. The earth does not get bigger.
What causes subduction to occur?
Subduction occurs when two plates collide at a convergent boundary and one plate is driven beneath the other back into the Earth’s interior. Not all convergence leads to subduction. Continental rocks are too buoyant to be forced downward so when continents collide they crumple but stay at the surface.
What causes the seafloor to spread apart at mid ocean ridges quizlet?
What causes the sea floor to spread apart at mid-ocean ranges? Hot magma rises through the boundaries at the mid-ocean ranges creating new rock as it cools and pushing the plates apart.
What are 3 types of evidence for seafloor spreading?
What three types of evidence provided support for the theory of sea floor spreading? eruptions of molten material magnetic stripes in the rock of the ocean floor and the ages of the rocks themselves.
How does convection inside the earth cause the tectonic plates lithosphere to move?
Convection currents describe the rising spread and sinking of gas liquid or molten material caused by the application of heat. … Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth’s crust.
What observations and data support seafloor spreading?
Abundant evidence supports the major contentions of the seafloor-spreading 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.
Who proved that the seafloor is spreading?
Harry H. Hess
The seafloor spreading hypothesis was proposed by the American geophysicist Harry H. Hess in 1960.
What process results in the ocean floor sinking beneath a deep ocean trench and back into the mantle?
The process by which the ocean floor sinks into the mantle is called Subduction ..
What process is shown occurring at ocean floor and why does it occur?
As the molten material cools it forms a strip of solid rock in the center of the ridge. Then more molten material splits apart the strip of solid rock that formed before pushing it aside. This process called sea-floor spreading continually adds new material to the ocean floor.
What happens between oceanic crust and continental crust at a subduction zone?
Oceanic crust is denser than continental crust. At a subduction zone the oceanic crust usually sinks into the mantle beneath lighter continental crust. (Sometimes oceanic crust may grow so old and that dense that it collapses and spontaneously forms a subduction zone scientists think.)
What process happens after subduction?
How does subduction cause the formation of land mass?
The process where one tectonic plate slides beneath another and blends into the Earth’s mantle is called subduction. As two plates grind against one another it results in the consequence of an earthquake in the subduction zone. Usually due to an open trench between the plates magma spills out during the process.
What is the process of subduction and what does it produce?
What describes one aspect of plate tectonics that involves subduction and seafloor spreading?
The statement that accurately describes the aspects of plate tectonics that involve sub-duction and seafloor spreading is : Crust is created at the coastlines of continents.
Which event causes the formation of trenches in Earth’s crust quizlet?
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 the first step of seafloor spreading a crack forms?
What is the first step of seafloor spreading? A crack forms in oceanic crust. Molten rock rises up through oceanic crust. Molten rock solidifies at the center of the ridge.
What is the process of plate tectonics?
The theory of plate tectonics states that the Earth’s solid outer crust the lithosphere is separated into plates that move over the asthenosphere the molten upper portion of the mantle. Oceanic and continental plates come together spread apart and interact at boundaries all over the planet.
What are the three main causes of plate tectonics?
Mantle dynamics gravity and Earth’s rotation taken altogether causes the plate movements. However convectional currents are the general thought for the motion.
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