- How is magnetic striping evidence of plate tectonics?
- How old is the oldest seafloor?
- What is the cause of the magnetic striping?
- What is the process of magnetic striping?
- Where is the youngest seafloor?
- What is a magnetic field flip?
- Which is evidence that supports the dynamo theory?
- Which is the first step in the seafloor spreading process?
- Where does seafloor spreading happen?
- What are the lines of evidence for the drifting continents?
- Where does magnetic striping exist?
- Who discovered magnetic striping?
- What is magnetic striping evidence of?
- What does magnetic striping tell us about the age of rocks?
- Where are the oldest sediments found?
How is magnetic striping evidence of plate tectonics?
During times of normal magnetic polarity, the rocks being created stayed normal.
If they were created during times of reverse polarity, the rocks would freeze that magnetic orientation in place..
How old is the oldest seafloor?
approximately 280 million years oldThe oldest seafloor is comparatively very young, approximately 280 million years old. It is found in the Mediterranean Sea and is a remnant of an ancient ocean that is disappearing between Africa and Europe.
What is the cause of the magnetic striping?
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. … Later, after the planet’s magnetic field flips again, the next stripe of new ocean floor aligns its polarity in the opposite direction.
What is the process of magnetic striping?
At spreading centres, this crust is separated into parallel bands of rock by successive waves of emergent magma. When Earth’s geomagnetic field undergoes a reversal, the change in polarity is recorded in the magma, which contributes to the alternating pattern of magnetic striping on the seafloor.
Where is the youngest seafloor?
Seafloor is youngest near the mid-ocean ridges and gets progressively older with distance from the ridge. Orange areas show the youngest seafloor. The oldest seafloor is near the edges of continents or deep sea trenches.
What is a magnetic field flip?
A geomagnetic reversal is a change in a planet’s magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused with geographic north and geographic south).
Which is evidence that supports the dynamo theory?
The correct answer is option B) Earth’s core contains a large amount of iron. The dynamo theory explains how celestial bodies develop magnetic fields. According to the theory, the magnetic field is generated by the motion of a rotating and electrically conducting fluid.
Which is the first step in the seafloor spreading process?
A crack forms in oceanic crust. Molten rock rises up through oceanic crust. Molten rock solidifies at the center of the ridge.
Where does seafloor spreading happen?
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.
What are the lines of evidence for the drifting continents?
Alfred Wegener, in the first three decades of this century, and DuToit in the 1920s and 1930s gathered evidence that the continents had moved. They based their idea of continental drift on several lines of evidence: fit of the continents, paleoclimate indicators, truncated geologic features, and fossils.
Where does magnetic striping exist?
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.
Who discovered magnetic striping?
Vine and Matthews noticed there was a symmetrical pattern of magnetic stripes on either side of the mid ocean ridges. In addition when the basalts of the sea floor were dated, they were found to be the same age at similar distances away from the ridge on each side.
What is magnetic striping evidence of?
Magnetic Stripes. Scientists discovered that the rock that makes up the ocean floor lies in a pattern of magnetized “stripes.” These stripes hold a record of reversals in Earth’s magnetic field. The rock of the ocean floor contains iron.
What does magnetic striping tell us about the age of rocks?
Magnetic stripes not only tell us about the age of the oceans, they can also reveal the timing and location of initial continental break-up. The oldest oceanic crust that borders a continent must have formed after the continent broke apart initially, and just as sea-floor spreading began.
Where are the oldest sediments found?
GreenlandEarth’s Oldest Sedimentary Rocks. Earth’s oldest sedimentary rocks, found in Greenland, are about 3.9 billion years old. Unusual chemical traces in these rocks may suggest that life existed when they formed.