Midocean ridges and oceanic crust author.
Activity 2 magnetic reversals and sea floor striping.
The motion of the earth s molten outer core produces a magnetic field that is characterized by force lines emanating from near the.
Magnetic reversals after molten lava emerges from a volcano it solidifies to a rock.
Distanoe my km.
These two things were the magnetic striping on the ocean floor and the age of seafloor rocks.
Plates i activity 2.
Assuming the distance to the farthest isochron is 300 km the spreading rate of the ridge was.
Periodic reversals of the earth s magnetic field are shown by the remanent magnetisation of rocks of the sea bed which have been used to demonstrate sea floor spreading.
Some of the worksheets for this concept are sea floor spreading work sea floor spreading a model of seafloor spreading inside earth work magnetic reversals activity name date sea floor spreading l 1 2 3 5 4 ovr l lesson 3 seafloor profiling seafloor spreading and subduction.
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.
Following up the activity.
The earth s magnetic polarity reverses and so does the magnetization of the ocean floor.
The figure below includes two images of the ocean floor.
It is as if the sea floor was a giant tape.
Magnetic striping of the sea floor after mid ocean ridges and trenches were discovered more evidence was discovered that helped to support the theory that the continents had moved around.
Magnetic reversals and sea floor striping a key factor in establishing the theory of plate tectonics was recognition of past reversals in the earth s magnetic field and the mapping of normal and reverse magnetic striping on the ocean floor.
The plates move apart carrying the new sea floor with it.
Magnetic striping in the pacific northwest 70 k as more and more of the seafloor was mapped during the 1950s the magnetic variations turned out not to be random or isolated occurrences but instead revealed recognizable patterns.
When the earth s magnetic field reverses a new stripe with the new polarity begins.
The idea that this.
Study maps of magnetic anomalies as measured over the oceanic ridges and look for the symmetrical patterns.
When these magnetic patterns were mapped over a wide region the ocean floor showed a zebra like pattern.
Magnetic reversals and sea floor striping created date.
This allows magma from under the surface to break up through the crust coming out and creating new sea floor.
300 km spreading rate.
Magnetic reversals and sea floor striping f.
Each strip therefore represents an epoch of one or the other magnetic polarity and the symmetry is also explained.
