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looking at patterns
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How do scientist date seafloor rocks?
Scientists date sea-floor rocks by looking at patterns in the rocks, including magnetic patterns, and by looking at the geomagnetic reversal time scale.
Where does the new rocks form on the sea floor?
Forms by lava from volcanoes on the sea floor
What have scientist learned about sea floor spreading?
Nothing
Why are sea floor rocks so young?
Sea floor rocks are young because of the process of seafloor spreading at mid-ocean ridges. As new oceanic crust forms at the ridges, older rocks get pushed further away. This continuous process creates a relatively young age for the sea floor rocks, with the oldest rocks being around 200 million years old.
How would the age of the oldest rocks on the continents compare with the age of the oldest rocks on the seafloor if the rock on the continents is continually formed but not removed?
The oldest rocks on the continents would be much older than the rocks on the sea floor because the rocks on the continents are not being removed unlike the rocks on the sea floor that are made by the mid-ocean ridge are being removed by deep ocean trenches. this prossess that is occuring on the sea floor is called sea floor spreading. evidence of this is the Pacific ocean shrinking and the Atlantic ocean growing.
How do scientist know that the continents are moving?
the ocean sea floor is spreading
What do scientist think caused Continental drift?
Sea-floor spreading
What happens in sea-floor spearding?
new rocks form
What are types of evidence that the sea floor is expanding?
Rocks have a north and south pole. The sea floor was discovered to have different magnetic poles on cracks in the ocean floor.
Identify how magnetic symmetry can be used as evidence of sea floor spreading?
As the sea floor spreads the magnetic orientation in the rocks as they cooled is preserved. As the earth's magnetic field changes then a distinct pattern is imprinted in the rocks. If sea floor spreading is true then this unique pattern should be the same on both sides from the spreading point. Measurements of sea bottom rocks verify this symmetry is true. :)
What discovery did scientist make when comparing the age of the sea floor to that of the continents?
The scientists realized that the continents were much older, leading them onto the theory of Sea Floor Spreading!
What do scientist use to measure the rate of movement of oceanic plates?
sea-floor spreading
