What is magnetic striping on the seafloor?
What Is Magnetic Striping? Magnetic Striping is when the sea floor is spreading, and magma from the mantle is rising through the Earth’s crust. That magma then turns into new crust, forming the “Oceanic Crust”.
What do you observe about the magnetic stripe pattern on each side of the oceanic ridge?
The stripes are symmetric across the Oceanic Ridge. They create a mirror image. It suggests that new seafloor is formed in the middle (at the Ridge) and some of the new seafloor moves to each side of the Ridge forming a symmetric pattern.
How do magnetic stripes prove seafloor spreading?
The specific magnetism of basalt rock is determined by the Earth’s magnetic field when the magma is cooling. Scientists determined that the same process formed the perfectly symmetrical stripes on both side of a mid-ocean ridge. Oceanic crust slowly moves away from mid-ocean ridges and sites of seafloor spreading.
What does the presence of magnetic stripes on the seafloor indicate about the orientation of Earth’s magnetic field over time?
During sea-floor spreading, magma erupts along a mid-ocean ridge to form new oceanic lithosphere. Strips of ocean-floor basalt record the polarity of Earth’s magnetic field at the time the rock formed. These strips form a pattern that is the same on both sides of the mid-ocean ridge.
Samples from the sea floor were brought up through the pipes. Then the scientists determined the age of the rocks in the samples. They found that the farther away from the ridge the samples were taken, the older the rocks were. This showed that sea- floor spreading really has taken place.
What does magnetic stripes pattern represent?
This represents periodic reversals in the direction of the Earth’s magnetic field.
What causes magnetic stripes on the seafloor quizlet?
Why does the rock of the ocean floor have a pattern of magnetic stripes? The rock of the ocean floor contains iron. As molten material cooled and hardenend, the iron bits inside lined up in the direction of Earth’s magnetic poles, creating a pattern of magnetized stripes.
Why are magnetic stripes on the seafloor parallel?
They are parallel because each magnetic stripe represents crust that formed and magnetized at a mid-ocean ridge during a period of either normal or reversed polarity.
Is the magnetic stripe pattern on each side of the ocean ridge equal?
Answer: Yep. When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.
Which magnetic stripe is the oldest How do you know?
The north pole becomes the south pole, and the south pole becomes the north pole. Rocks of normal and reversed polarity are found in stripes symmetrically about the mid-ocean ridge axis. The seafloor is youngest at the ridge crest and oldest far away from the ridge crest.
How were scientists able to determine the date of the magnetic reversals during seafloor spreading? A record of Earth’s magnetic field is recorded in oceanic rocks, which show a clear pattern of changes in Earth’s magnetic polarity.
What does this tell you about the length of time represented by normal and reversed polarity?
Answer. If we know the absolute ages of rocks on either side of a reversal (normal to reversed, or reversed to normal), then we know that the time of the reversal must have been between the known dates. In this way, scientists have assigned ages to the magnetic anomaly pattern seen around the world.
Why do magnetic stripes on both sides of Mid Atlantic ridge parallel to each other?
When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. As it cools it becomes permanently magnetized in the direction of the Earth’s magnetic field. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.
What is the strongest evidence of 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.
Why is it important that your model have an identical pattern of stripes on both sides of the center slit?
Why is it important that your model have an identical pattern of strips on both sides of the center slit? The model has identical strips because, as the magma rises at the mid ocean ridge ½ goes to the right and ½ goes to the left of the mid ocean ridge. Each one of these strips represents Earth’s magnetic history.
What do side slits stand for?
where subduction has occurred
The center slit represents a Mid-Ocean Ridge 2. The strips of paper represent oceanic crust or seafloor.
What feature of the ocean floor does the center slit stand for quizlet?
Terms in this set (9) What feature on the ocean floor does the center slit stand for? central valley of mid-ocean ridge where molten material is upwelling from below.
What do the different colored stripes on the paper represent?
Answer: What do the stripes represent? The stripes on the paper represent magnetic oscillations from spreading ridges. The middle slit represents an ocean ridge, and what is happening here is the creation of new ocean floor.
Where is the old ocean floor removed?
The oldest known ocean floor is dated at about 200 million years, indicating that older ocean floor has been destroyed through subduction at deep-sea trenches.
Why are the most ancient rocks found on the continents not on the ocean floor?
Why are the most ancient rocks found on the continents, not on the ocean floor? The ocean floor is constantly created and destroyed rather quickly. The continental crust is less dense so the oceanic crust subducts back to the mantle. This process explains why the younger rocks are found on the ocean floor.
Why is the Pacific Ocean getting smaller while the Atlantic Ocean is getting wider?
The Atlantic Ocean is getting bigger and the Pacific Ocean is getting smaller. Again, this comes down to plate tectonics because the Pacific Ocean has subduction zones on three sides ” where the Pacific plate submerges beneath other plates.
Sea-floor spreading is what happens at the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor. As the plates move apart, new material wells up and cools onto the edge of the plates.
Who proved that the seafloor is spreading?
Harry H. Hess
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