How did paleomagnetic stripes help to prove that the ocean floor is spreading at a mid ocean ridge?

They stated that the magnetic striping was due to paleomagnetism. The striping revealed magnetic reversals in the Earth’s poles as oceanic crust moved away from the mid-oceanic ridges by seafloor spreading.

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How is paleomagnetism evidence of plate tectonics?

Paleomagnetism also provides evidence to support theories in plate tectonics. Because the ocean floor is mostly composed of basalt, an iron-rich substance containing minerals that align with the magnetic field, they record the alignment of the magnetic fields surrounding oceanic ridges.

What evidence is there for sea floor spreading at the mid-ocean ridge?

Supporting Evidence for Seafloor Spreading

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.

How are magnetic stripes evidence of seafloor spreading?

These patterns of stripes provide the history of seafloor spreading. Geophysicists can read these patterns from the magnetic anomalies they measure with a magnetometer. Where the magnetic wiggles, or anomalies, are broader, the spreading rate has been faster.

What is the major evidence that sea-floor spreading creates new lithosphere explain your answer?

The record of magnetic reversals is carried away from each side of the spreading center of a mid-ocean ridge, showing that the molten rock is creating new lithosphere.

Why are there paleomagnetic stripes on the ocean floor?

Since the rocks that make up the seafloor solidify at times when the Earth’s magnetic field is both normal and reversed, the rocks become magnetized in stripes of various widths, depending on how long the field remainined in one position and how fast the seafloor was spreading.

Which is a key piece of evidence for sea-floor spreading?

The theory of seafloor spreading states that new ocean crust is continually being formed, and that this crust is slowly carried away from its point of origin over a period of time. The study of the repeated reversal of the Earth’s magnetic poles over time has provided convincing evidence of seafloor spreading.

How does magnetic stripes happen?

The magnetic pole reverses from time to time. 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.

What are the lines of evidence that support the plate movement?

Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. Some life “rode” on diverging plates, became isolated, and evolved into new species.

What did paleomagnetic evidence prove?

The alignment of a magnetic mineral in a cooled igneous rock points to the magnetic north pole, and the dip of the mineral reveals how far the rock formed from the pole. The paleomagnetic evidence revealed that the magnetic poles also had different locations relative to the continents than they do today.

What is paleomagnetic evidence?

Paleomagnetism is the study of the ancient magnetic field of both rocks and the Earth as a whole. Paleomagnetism has provided very strong quantitative evidence for polar wander and continental drift.

How do magnetic stripes on the ocean floor serve as evidence for seafloor spreading quizlet?

How do strips of magnetized rock on the ocean floor provide evidence of sea-floor spreading? 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.

What do the magnetic stripes pattern represents?

This represents periodic reversals in the direction of the Earth’s magnetic field.

How did geologic samples from the ocean floor support the theory of plate tectonics?

The seafloor drilling system led to the evidence that supports the seafloor-spreading hypothesis. The samples obtained from the seafloor drill reveals that the rocks away from the mid-oceanic ridge were relatively older than the rocks near to it.

Why does the sea floor have a striped pattern of magnetic anomalies that is symmetric with respect to the mid-ocean ridge?

Why does the sea floor have a striped pattern of magnetic anomalies that is symmetric with respect to the mid-ocean ridge? –The polarity of Earth’s magnetic field experiences reversals. -The igneous rock of the ocean floor preserves Earth’s existing magnetic field as the rock cools.

How do magnetic stripes of iron in ocean rock?

How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading? They show when Earth’s poles reversed. They show how the density of the seafloor has changed.

How do magnetic stripes show the history of Earth’s magnetic field?

These magnetic patterns are parallel to the mid-ocean ridges and symmetrical on both sides. As rocks crystallize from lava at the ridges, they literally record the magnetic field of the Earth at the time of their creation.

What is the magnetic pattern of ocean floor rocks on one side of an ocean ridge?

The positive and negative areas of the seafloor form a series of stripes that were parallel to ocean ridges. The magnetic pattern on one side of the ridge is a mirror image of the pattern on the other side of the ridge.

What evidence was used to support magnetic pole reversals quizlet?

Reversals in Earth’s magnetic field are recorded in iron-rich rocks, such as basalts. Age dating layered basalts yields the timing of the archived magnetic reversals. measure sea-floor bathymetry.

How do fossils help prove that the continents move?

One type of evidence that strongly supported the Theory of Continental Drift is the fossil record. Fossils of similar types of plants and animals in rocks of a similar age have been found on the shores of different continents, suggesting that the continents were once joined.

How did discovery of magnetic reversals confirm the seafloor spreading hypothesis?

The discovery of magnetic reversals confirmed the sea floor spreading hypothesis by showing that the rocks on either side of the ridge revealed the same polarity equally. Each time there was a polarity change noted on one side of the ridge, it was the same on the other side of the ridge.

What are three features of the ocean floor?

• Continental shelf. Starting from land, a trip across an ocean basin along the seafloor would begin with crossing the continental shelf. …
• Abyssal plains. Continuing your journey across the ocean basin, you would descend the steep continental slope to the abyssal plain. …
• Mid-ocean ridge. …
• Ocean trenches.

When sea floor spreading occurs new crust is added to the ocean floor?

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 are the lines of evidence?

These lines of evidence include: Fossil evidence and transitional features. Distribution in time and space. Homologies.

What are the four lines of evidence for continental drift?

The four pieces of evidence for the continental drift include continents fitting together like a puzzle, scattering ancient fossils, rocks, mountain ranges, and the old climatic zones’ locations.

How do earthquakes provide evidence for plate tectonics?

Observations show that most earthquakes are associated with tectonic plate boundaries and the theory of plate tectonics can be used to provide a simplified explanation of the global distribution of earthquakes, while some of the characteristics of earthquakes can be explained by using a simple elastic rebound theory.

Which of the following statements is true about a mid ocean ridge?

Which of the following statements is TRUE about a mid-ocean ridge? It is located at a divergent boundary where tectonic plates move apart. Which tectonic plate setting is associated with the following features: great earthquakes; explosive volcanic eruptions; oceanic plate sinks into mantle and remelts?

What did scientists conclude when they discovered that stripes of ocean floor?

When scientists studied the magnetic properties of the seafloor, they discovered normal and reversed magnetic stripes with different widths. These magnetic patterns are parallel to the mid-ocean ridges and symmetrical on both sides.

What does this pattern suggest about how the seafloor forms?

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.

What geologic feature is formed undersea mountains?

A seamount is an underwater mountain. A rise is an underwater mountain range located where tectonic plates are spreading apart. A rise is also known as a mid-ocean ridge.

How does earthquake patterns support the theory of plate tectonics?

More evidence was needed to support this theory, however. When scientist mapped out earthquake patterns around the world, they discovered that the location of earthquakes were associated with the locations of the subduction zones. This further provided evidence for plate tectonics.

What causes tectonic plates to 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.

How do magnetic stripes provide evidence of seafloor spreading?

When the Earth’s magnetic field reverses, a new stripe, with the new polarity, begins. Such magnetic patterns led to recognition of the occurrence of sea-floor spreading, and they remain some of the strongest evidence for the theory of plate tectonics.

What creates 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.

What is the orientation of the magnetic stripes of iron contained in rocks that support the idea of seafloor spreading?

Answer: When magma rises in the divergent boundary, as new crust is formed, the iron minerals in the magma align themselves with the earth’s magnetic field before the magma cools to rock. Iron minerals have a ferromagnetic property about them. This is why the rocks layers in the sea floor spreading have bands.

Why were magnetic patterns found on the ocean floor puzzling?

Why were magnetic patterns found on the ocean floor puzzling? They showed alternating bands of normal and reversed polarity. No rocks were magnetic. They did not show alternating bands of normal and reversed polarity.

What do the striped sections of the diagram represent oceanography?

The strips of paper represent oceanic crust or seafloor. 3. The oldest sections should be the sections on both sides furthest from the middle 4. Seafloor spreading is the creation of new seafloor or new oceanic crust 5.

Why magnetic stripes in the Pacific Ocean are wider than in the Atlantic Ocean?

Magnetic stripes in the Pacific Ocean are wider because the seafloor spreads more rapidly there than in the Atlantic Ocean.

What factors cause magnetic stripes to form along the ocean floor?

The striped magnetic pattern develops because, as oceanic crust pulls apart, magma rises to the surface at mid-ocean ridges and spills out to create new bands of ocean floor.

How do magnetic stripes on the ocean floor serve as evidence for seafloor spreading quizlet?

How do strips of magnetized rock on the ocean floor provide evidence of sea-floor spreading? 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.

How do magnetic stripes of iron in ocean rock Brainly?

Answer: They show how the density of the sea floor has changed. They reveal a matching pattern on either side of the ridge . They reveal differences in the mineral composition of newly created rock.

What do magnetic stripes confirm?

The pairs of magnetic stripes confirm that the ocean crust formed at mid-ocean ridges is carried away from the center of the ridges in opposite directions.

How do magnetic anomaly patterns on the ocean floor best serve as evidence for seafloor spreading?

magnetic polarity reversals. How do magnetic anomaly patterns on the ocean floor best serve as evidence for seafloor spreading? The symmetry on either side of mid-ocean ridges shows that new crust is created and then split apart.

Why are some magnetic stripes wider than others?

I would suggest that some stripes are wider than others because during the formation of new lithosphere, more molten material could have came out of the asthenosphere than during the previous spread cycle.

Why does the sea floor have a striped pattern of magnetic anomalies that is symmetric with respect to the mid-ocean ridge?

Why does the sea floor have a striped pattern of magnetic anomalies that is symmetric with respect to the mid-ocean ridge? –The polarity of Earth’s magnetic field experiences reversals. -The igneous rock of the ocean floor preserves Earth’s existing magnetic field as the rock cools.

What are the lines on the ocean surface?

These lines are artifacts of the ocean floor mapping process. Oceanographers use sonar—sound waves—to map the ocean bottom. These sonar readings are typically taken by ships towing submersible devices that send out sound waves.

How is fossil record evidence of evolution?

Fossils provide evidence for the evolutionary change through now extinct forms that led to modern species. For example, there is a rich fossil record that shows the evolutionary transitions from horse ancestors to modern horses that document intermediate forms and a gradual adaptation o changing ecosystems.

How did Wegener explain similar fossils on different continents?

How did Wegener explain similar fossils on different continents? Since neither reptile could have swum great distances across salt water he inferred that they once lived on a single landmass that has since split apart. How did Wegener think that mountains formed? When continents collide, their edges crumple up.

What are magnetic stripes on the ocean floor?

At the mid-ocean ridge spreading axis, these flips in the direction of the Earth’s magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.

How did the discovery of magnetic reversals confirm the sea floor spreading hypothesis quizlet?

The discovery of magnetic reversals confirmed the sea floor spreading hypothesis by showing that the rocks on either side of the ridge revealed the same polarity equally. Each time there was a polarity change noted on one side of the ridge, it was the same on the other side of the ridge.

What is used as evidence for sea floor spreading?

The theory of seafloor spreading states that new ocean crust is continually being formed, and that this crust is slowly carried away from its point of origin over a period of time. The study of the repeated reversal of the Earth’s magnetic poles over time has provided convincing evidence of seafloor spreading.

What evidence supports magnetic pole reversals?

We can see evidence of magnetic polarity reversals by examining the geologic record. When lavas or sediments solidify, they often preserve a signature of the ambient magnetic field at the time of deposition. Incredible as it may seem, the magnetic field occasionally flips over!

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