Subduction and sea floor spreading are processes that could alter the size and form of the ocean.
Real life sea floor spreading.
The magnetism of mid ocean ridges helped scientists first identify the process of seafloor spreading in the early 20th century.
Paper strip represents seafloor 2.
When the strips of paper are pulled out what process does this represent.
Seafloor spreading theory that oceanic crust forms along submarine mountain zones and spreads out laterally away from them.
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This idea played a pivotal role in the development of the theory of plate tectonics which revolutionized geologic thought during the last quarter of the 20th century.
The ridge sits atop a geologic feature known as the mid atlantic rise which is a progressive bulge that runs the length of the atlantic ocean with the ridge resting on the highest point of this linear bulge this bulge is thought to be caused by upward convective forces in the asthenosphere pushing.
This graphic shows several ocean floor features on a scale from 0 35 000 feet below sea level.
For instance the atlantic ocean is believed to be expanding because of its few trenches.
Seafloor spreading definition a process in which new ocean floor is created as molten material from the earth s mantle rises in margins between plates or ridges and spreads out.
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What does the paper strip used in the model represent in real life.
Due to this continuous seafloor spreading occurs and makes atlantic ocean floor to be connected to other continental crust making the ocean gets wider over the time.
Learn more about sea floor spreading and how it works with this demo.
The following features are shown at example depths to scale though each feature has a considerable range at which it may occur.
Continental shelf 300 feet continental slope 300 10 000 feet abyssal plain 10 000 feet abyssal hill 3 000 feet up from the abyssal plain seamount 6 000 feet.
The magnet represents the earth s magnetic field 4.
Basalt the once molten rock that makes up most new oceanic crust is a fairly magnetic substance and scientists began using magnetometers to measure the magnetism of the ocean floor in the 1950s what they discovered was that the magnetism of the ocean floor around.
Pulling out the strips of paper represents the process of seafloor spreading 3.
