Activity 2 Magnetic Reversals And Sea Floor Striping

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.

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. 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. 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.

The figure below includes two images of the ocean floor. 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. 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. Magnetic reversals and sea floor striping created date.

Label the age of each isochron solid line at the bottom of the right hand side of the map using the information recorded on your ocean floor map. Midocean ridges and oceanic crust author. Distanoe my km. It is as if the sea floor was a giant tape.

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. When the earth s magnetic field reverses a new stripe with the new polarity begins. The earth s magnetic polarity reverses and so does the magnetization of the ocean floor. These two things were the magnetic striping on the ocean floor and the age of seafloor rocks.

Each strip therefore represents an epoch of one or the other magnetic polarity and the symmetry is also explained. The plates move apart carrying the new sea floor with it. Plates i activity 2. When these magnetic patterns were mapped over a wide region the ocean floor showed a zebra like pattern.

Magnetic reversals and sea floor striping f. Displaying top 8 worksheets found for activity seafloor spreading. This allows magma from under the surface to break up through the crust coming out and creating new sea floor. Magnetic striping magnetic minerals are found in rocks.

The idea that this. 300 km spreading rate.