Activity 2 Magnetic Reversals And Sea Floor Striping

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.

Activity 2 magnetic reversals and sea floor striping.

The figure below includes two images of the ocean floor. 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. Study maps of magnetic anomalies as measured over the oceanic ridges and look for the symmetrical patterns. This allows magma from under the surface to break up through the crust coming out and creating new sea floor.

Each strip therefore represents an epoch of one or the other magnetic polarity and the symmetry is also explained. 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 earth s magnetic polarity reverses and so does the magnetization of the ocean floor. 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.

When these magnetic patterns were mapped over a wide region the ocean floor showed a zebra like pattern. 300 km spreading rate. Assuming the distance to the farthest isochron is 300 km the spreading rate of the ridge was. The idea that this.

Following up the activity. Magnetic striping magnetic minerals are found in rocks. Displaying top 8 worksheets found for activity seafloor 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.

Distanoe my km. Magnetic reversals and sea floor striping f. Plates i activity 2. These two things were the magnetic striping on the ocean floor and the age of seafloor rocks.

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. The plates move apart carrying the new sea floor with it. When the earth s magnetic field reverses a new stripe with the new polarity begins. Magnetic reversals and sea floor striping created date.

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.