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What did the magnetic strips prove in seafloor spreading?
They proved that the seafloor was spreading.
How did the seafloor spreading help prove the continental drift?
Seafloor spreading provided evidence for continental drift by showing that new oceanic crust is formed at mid-ocean ridges, pushing older crust away. This process helped explain how continents could move and supported the idea of plate tectonics. The pattern of magnetic stripes on the seafloor also matched with predictions based on the movement of continents, further supporting the theory of continental drift.
How do magnetic stripes on the sea floor prove the sea floors spreading?
ok so... over time, the magnetic poles kept changing directions. for example ur compass wuld suddenly turn the opposite direction. there was this type of rock(forgot the name) that always points the direction of the magnetic pole. this type of rock erupts from the bottom of the ocean floor. scientists found that the rocks at the ocean floor would change direction in order. like, one section of the rock would be pointing north, and one section would be pointing south, vice versa. they knew that since the rocks change directions, new ocean floor was forming and were pushing the continents away from each other. the sea was alos spreading. i used this 4 my hw u better not go 2 my middle school(chaparral)
How are the stripes of magnetism on each side of the ridge related?
These stripes, often called Zebra Stripes due to the alternating colors of the original magnetometer readings when the first observations were made. It is directly related to two processes...geomagnetic reversals and seafloor spreading. Seafloor spreading is easier to start with. Take the Mid-Atlantic Ridge running along the middle of the Atlantic Ocean. It is essentially a gap in the crust through which molten material from the mantle is pushed up through the crust. When it hits the water, the cold water rapidly cools it. As it continues to push out and harden, it very slowly pushes against the tectonic plates running along the ridge, causing them to spread apart. While they don't always run straight through the middle of an ocean, they will occur along plate boundaries. I've seen various maps showing tectonic plates that have arrows to show the direction of movement. Look for spreading ridges wherever you seen arrows pointed apart on these maps. Now, as the molten material comes out and hardnes, small amounts of magnetic elements crystalize in the rock as it forms, oriented in the direction of the Earth's magnetic field. Consider current rocks forming as stripe 1. Now, Earth's magnetic field fluctuates. This is normal and usually within small fluctuations. However, at times, it begins to break down. Eventually, when it does, it will rapidly flip over and a new magnetic field will begin to form in the reverse direction. This is Geomagnetic reversal. It used to be believed that it was quite random, though some scientists have argued that there is a pattern to it. It should also be noted that there isn't a specific time frame for how long they last or when they occur. Some will last for a few thousand years, some for a few tens of thousands of years, some for a few hundred thousand years. It varies quite a bit. We are still trying to understand this process, so we don't have definite answers as to what causes the whole process to work. Now, go back to the seafloor spreading. As the spreading occurs, imagine that a reversal occurs. You begin to see rocks forming with those magnetic fields pointing the other way. Stripe 2. The next reversal will bring it back to what our field looks like now...making stripe 3. And so on. When is the next reversal going to happen...well we don' t have an exact answer. But one estimate puts it between 3000 and 4000 A.D., provided that the current evidence of deterioration continues and isn't a short term effect. Since this is all a relatively new concept, we honestly don't exactly what characteristics we will see when it begins to happen, making it hard to predict. At least not yet. It should also be noted that the discovery of both seafloor spreading in the 1960's and geomagnetic reversals a bit earlier than that were the major pieces of evidence used to prove the theory of plate tectonics.
Why was the theory of seafloor spreading rejected?
The theory of seafloor spreading was not rejected; in fact, it is widely accepted in the field of geology. Proposed by Harry Hess in the early 1960s, seafloor spreading explains how new oceanic crust is formed at mid-ocean ridges and then moves away as tectonic plates drift apart. This concept revolutionized our understanding of plate tectonics and the Earth's geology.
What did the magnetic strips prove in seafloor spreading?
They proved that the seafloor was spreading.
How do scientists prove seafloor spreading?
Scientists prove seafloor spreading through various methods, including mapping of magnetic stripes on the ocean floor, analysis of seismic activity, and examination of rock samples collected from the ocean crust. These techniques provide evidence of tectonic plate movement and the creation of new oceanic crust at mid-ocean ridges.
What three pieces of evidence did Harry Hess gather to prove that seafloor spreading was taking place?
Magnetic stripes on the seafloor showed alternating patterns of normal and reversed polarity, matching Earth's magnetic field reversals. Age dating of seafloor rocks revealed that rocks were youngest along mid-ocean ridges and oldest near continental margins. Sediment thickness on the seafloor was thinnest at mid-ocean ridges and thickest near the continents, supporting the idea of seafloor spreading.
How did the seafloor spreading help prove the continental drift?
Seafloor spreading provided evidence for continental drift by showing that new oceanic crust is formed at mid-ocean ridges, pushing older crust away. This process helped explain how continents could move and supported the idea of plate tectonics. The pattern of magnetic stripes on the seafloor also matched with predictions based on the movement of continents, further supporting the theory of continental drift.
What tools were used to prove seafloor spreading?
Tools such as sonar mapping, geologic sampling, and paleomagnetism studies were used to provide evidence for seafloor spreading. Sonar mapping allowed for the creation of detailed maps of the ocean floor, revealing features such as mid-ocean ridges and deep-sea trenches. Geologic sampling involved collecting rock samples from the ocean floor to study their age and composition. Paleomagnetism studies focused on analyzing the alignment of magnetic minerals in rocks, providing evidence of past changes in Earth's magnetic field that support the idea of seafloor spreading.
How do magnetic stripes on the sea floor prove the sea floors spreading?
ok so... over time, the magnetic poles kept changing directions. for example ur compass wuld suddenly turn the opposite direction. there was this type of rock(forgot the name) that always points the direction of the magnetic pole. this type of rock erupts from the bottom of the ocean floor. scientists found that the rocks at the ocean floor would change direction in order. like, one section of the rock would be pointing north, and one section would be pointing south, vice versa. they knew that since the rocks change directions, new ocean floor was forming and were pushing the continents away from each other. the sea was alos spreading. i used this 4 my hw u better not go 2 my middle school(chaparral)
What are 3 things of evidence that scientists have that prove the ocean is spreading?
1) seafloor spreading 2) continental drift 3 i only found 2
What is sea floor spreading and what evidence do we have to prove it is happening?
Magnetic minerals on the ocean floor.
Did seafloor spreading prove the theory of continental drift?
Yes, seafloor spreading provided concrete evidence for the theory of continental drift proposed by Alfred Wegener. It demonstrated that new oceanic crust was continuously forming at mid-ocean ridges, pushing the continents apart over time. This supported the idea that continents were once connected and have since moved to their current positions.
How are the stripes of magnetism on each side of the ridge related?
These stripes, often called Zebra Stripes due to the alternating colors of the original magnetometer readings when the first observations were made. It is directly related to two processes...geomagnetic reversals and seafloor spreading. Seafloor spreading is easier to start with. Take the Mid-Atlantic Ridge running along the middle of the Atlantic Ocean. It is essentially a gap in the crust through which molten material from the mantle is pushed up through the crust. When it hits the water, the cold water rapidly cools it. As it continues to push out and harden, it very slowly pushes against the tectonic plates running along the ridge, causing them to spread apart. While they don't always run straight through the middle of an ocean, they will occur along plate boundaries. I've seen various maps showing tectonic plates that have arrows to show the direction of movement. Look for spreading ridges wherever you seen arrows pointed apart on these maps. Now, as the molten material comes out and hardnes, small amounts of magnetic elements crystalize in the rock as it forms, oriented in the direction of the Earth's magnetic field. Consider current rocks forming as stripe 1. Now, Earth's magnetic field fluctuates. This is normal and usually within small fluctuations. However, at times, it begins to break down. Eventually, when it does, it will rapidly flip over and a new magnetic field will begin to form in the reverse direction. This is Geomagnetic reversal. It used to be believed that it was quite random, though some scientists have argued that there is a pattern to it. It should also be noted that there isn't a specific time frame for how long they last or when they occur. Some will last for a few thousand years, some for a few tens of thousands of years, some for a few hundred thousand years. It varies quite a bit. We are still trying to understand this process, so we don't have definite answers as to what causes the whole process to work. Now, go back to the seafloor spreading. As the spreading occurs, imagine that a reversal occurs. You begin to see rocks forming with those magnetic fields pointing the other way. Stripe 2. The next reversal will bring it back to what our field looks like now...making stripe 3. And so on. When is the next reversal going to happen...well we don' t have an exact answer. But one estimate puts it between 3000 and 4000 A.D., provided that the current evidence of deterioration continues and isn't a short term effect. Since this is all a relatively new concept, we honestly don't exactly what characteristics we will see when it begins to happen, making it hard to predict. At least not yet. It should also be noted that the discovery of both seafloor spreading in the 1960's and geomagnetic reversals a bit earlier than that were the major pieces of evidence used to prove the theory of plate tectonics.
Why was the theory of seafloor spreading rejected?
The theory of seafloor spreading was not rejected; in fact, it is widely accepted in the field of geology. Proposed by Harry Hess in the early 1960s, seafloor spreading explains how new oceanic crust is formed at mid-ocean ridges and then moves away as tectonic plates drift apart. This concept revolutionized our understanding of plate tectonics and the Earth's geology.
How does the mid ocean ridge magnetic signal prove sea floor spreading?
New oceanic crust is being created at the mid-ocean rift zones, a global divergent plate boundary system where uprising magma fills in the spaces being created by the pulling apart of plates. Part of the newly forming crust follows the direction of one plate, and part of the newly forming crust follows the direction of the other plate; therefore, the age of the rock created from the magma has a mirror image on either side of the rift. As new oceanic crust is continuously being formed at the mid-ocean ridges by upwelling molten rock, the direction of Earth's magnetic field is recorded in the rock by the orientation of magnetic minerals, which align themselves in the direction of the magnetic field before the rock completely crystallizes. Earth's magnetic field is known to change its orientation with frequency on a geologic time scale, thus a pattern of stripes of magnetic orientation is formed which can be detected with a magnetometer. The discovery of magnetic stripes on the seafloor have allowed researchers to provide additional proof that new crust is being created, and that magnetic reversals have occurred and will occur in the future. They tell us that over the course of thousands of years, Earth's polarity will reverse itself. The stripes are the magnetic "footprint" of Earth's shifting magnetic field.
