What are the 4 steps 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.
- 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.
What are the steps in the process of sea-floor spreading?
Mar 24, 2022 · Similarly, what is the first step of seafloor spreading quizlet? Sea-Floor Spreading begins at a mid-ocean ridge, which forms along a crack in the oceanic crust. along the ridge, molten material that forms several kilometers beneath the surface rises and erupts. at the same time, older rock moves outward on both sides of the ridge.
What are facts about seafloor spreading?
Feb 22, 2010 · Magma flows outward in the ocean in all directions and hardens to form new ocean floor by the ridge. New ocean floor pushes the old floor away from the mid-ocean ridge The old floor then pushes the...
How fast does seafloor spread?
May 15, 2020 · 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. Click to see full answer. Consequently, what are the three types of seafloor spreading?
What evidence was used to support seafloor spreading?
The sequence of sea-floor spreading is 1. magma from the asthenosphere fills cracks in the ocean crust along mid-ocean ridges; 2. magma cools to form new ocean floor; 3 ocean floor moves away from the ridge 4. ocean floor eventually settles back into the mantle at the subduction zone
What are the 4 evidences of seafloor spreading?
Harry Hess's hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. This evidence was from the investigations of the molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes.
What is the steps of seafloor spreading?
Terms in this set (8) A long crack in the oceanic crust forms at a mid ocean ridge. Molten material rises and erupts along the ridge. Older rock moves outward on both sides of the ridge. Molten material cools and forms a strip of solid rock in the centre of the ridge.Jan 1, 2022
What is the first step of the 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 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.Nov 30, 2021
What is the process of seafloor spreading and subduction?
In some places, oceanic plates collide with continental plates. When this occurs, the heavier oceanic lithosphere sinks beneath the continental plate. This process, called subduction, creates a very deep trough near the line of contact between the oceanic and continental plates. This trough is called an oceanic trench.Dec 7, 2016
What are the steps in the formation of 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.
Which is the first step in the seafloor spreading process a crack forms in oceanic crust?
A crack forms in oceanic crust. Molten rock rises up through oceanic crust. Molten rock solidifies at the center of the ridge. New material pushes older rock away from the ridge.Dec 20, 2021
What is seafloor spreading quizlet?
In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. As a result, the ocean floors move like conveyor belts, carrying the continents along with them.
How is pillow lava evidence of seafloor spreading?
Seafloor Spreading Because the lava erupts into water, it cools rapidly and forms rounded structures called pillow lavas. As the seafloor continues to spread apart, the older oceanic crust moves away from the mid-ocean ridge.
What are the types of seafloor spreading?
There are three types of plate-plate interactions based upon relative motion: convergent, where plates collide, divergent, where plates separate, and transform motion, where plates simply slide past each other.
What is an example of seafloor spreading?
Seafloor spreading occurs along mid-ocean ridges—large mountain ranges rising from the ocean floor. The Mid-Atlantic Ridge, for instance, separates the North American plate from the Eurasian plate, and the South American plate from the African plate.Jun 8, 2015
How might a scientist test this hypothesis of seafloor spreading?
A test of the hypothesis of sea-floor spreading was provided by studies of the Earth's magnetism. The Earth's Magnetic Field — The Earth's magnetic field is thought to arise from the movement of liquid iron in the outer core as the planet rotates.
What is the process that Hess proposed?
In 1960, Hess proposed a radical idea. He suggested that a process he called sea-floor spreading continually adds new material to the ocean floor. In sea- floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. This material hardens to form the rock of the ocean floor.
What evidence supports Hess's theory of seafloor spreading?
Several types of evidence supported Hess's 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. This evidence led scientists to look again at Wegener's hypothesis of continental drift.
Where does seafloor spreading occur?
Sea-Floor Spreading begins at a mid-ocean ridge, which forms along a crack in the oceanic crust. along the ridge, molten material that forms several kilometers beneath the surface rises and erupts. at the same time, older rock moves outward on both sides of the ridge.
Where does magma come from?
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.
What is the Seafloor Spreading Theory?
What is seafloor spreading theory? When looking at a map of the Atlantic Ocean, it looks like the continents could fit together like a puzzle.
Who Discovered Seafloor Spreading?
The discovery of seafloor spreading is credited to Harry Hess, who first proposed the idea in the early 1960s. During World War II, Hess had been an admiral in the Navy, traveling aboard vessels that used sonar to locate German U-boats. Since he was also a geologist, he was naturally interested in ocean floor topography as well.
Seafloor Spreading Diagram
The force that causes seafloor spreading and the moving of continents and tectonic plates originates at the earth's extremely hot, dense core. This heat energy transfers out through the layers within the earth. At a certain level within the upper mantle, the heat causes the material to melt and become molten.
Evidence of Seafloor Spreading
Scientists have collected and studied a great deal of data since Hess first proposed his idea of seafloor spreading. They have studied the ages of the rock making up the oceanic crust and the sediment lying on top of it; they have examined the magnetic orientation of iron crystals in the rocks at various locations.
