The discovery of this phenomenon was an important bit of evidence that helped confirm the theory of plate tectonics.
Interactive sea floor spreading games.
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As magma starts to harden into rock iron rich minerals solidify first.
Seafloor spreading is the movement of magma through a crack in a mid oceanic ridge.
South becomes north and north becomes south.
The interactive animation below illustrates this concept.
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One intriguing thing about the rock that comes from seafloor spreading is that it shows the history of the earth.
The cycle of new seafloor forming and old seafloor subducting is extremely slow with the plates shifting just a few centimeters per year.
Because it takes a long time for the crust to move the crust at the trenches is about 200 million years old.
Once the basalt cools completely into solid rock the.
Their crystals are pulled into alignment by the earth s magnetic field just like a compass needle is pulled towards magnetic north.
Plate tectonics and sea floor spreading for science interactive notebooks teaching the concept of sea floor spreading can be easily modeled using my simple yet powerful interactive resource for science interactive notebooks.
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For example every million years the earth s magnetic poles tend to reverse 4 or 5 times.
The process is continuous because forces cause opposite sides of the midocean ridge to constantly move apart making new room for the process to repeat.
Most basalt magmas contain abundant molten iron.
Play continental drift and seafloor spreading games in an arcade style format.
Search for the seafloor.
In total there are nine games in this learning objective including.
Rocks on the seafloor on either side of a mid ocean spreading ridge preserve a record of the earth s magnetic field over time.
Seafloor spreading is the continuous process of forming new igneous rock at midocean ridges by injection of magma that forms new seafloor.
The rocks on the seafloor show the history of the magnetic changes in the earth.