The three are different. The first is Molten Material,which is indeed erupting along mid-ocean ridges. The scientists dived to the ocean floor in Alvin, a small sumbarine. Alvin was built to withstand the crushing pressures four kilometers down in the ocean. A ridge's central valley, Alvin's crew found strange rocks shaped like pillows. Other rocks looked like toothpaste squeezed from a tube. Such rocks form only when molten material hardens quickly under again and again along the mid-ocean ridges.
The second is Magnetic Stripes, which are patterns of the ocean floor that provided more support for sea-floor spreading. Earth's magnetic poles have reversed themselves many times during Earth's history. The last reversal happened 780,000 years ago.
The third and final one is Drilling Samples, which came from rock samples obtained by drilling into the ocean floor. The Glomar Challenger, a drilling ship built in 1968, gathered the samples. The Glomar Challenger sent drilling pipes through water six kilometers deep to drill holes in the ocean floor. This feat has been compared to digging a hole into the sidewalk from the top of the Empire State Building.
Information from: California Earth Science Textbook, pages 152-153.
Hope this helps! ☺
-SmallvilleGrl
Three evidence that supports Harry Hess theory of Seafloor Spreading is; 1. Paleomagnetism. 2. Plate Tectonics. 3. Polar Wondering and Polar Reversal.
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The ages of the rocks become older the farther the way they are from the ridges. The closer they are the younger it is. This leaves evidence to the seafloor spreading theory.
Rocks in the seafloor are moving one place to another
seafloor spreading
They proved that the seafloor was spreading.
A diagram that shows how seafloor spreading works.
Seafloor spreading is triggered by a rift in a continental land mass.
Gravity in the oceanic crust is responsible for seafloor spreading.
Seafloor Spreading
Seafloor Spreading helped move the Continents to their current location.
Three evidence that supports Harry Hess theory of Seafloor Spreading is; 1. Paleomagnetism. 2. Plate Tectonics. 3. Polar Wondering and Polar Reversal.
When seafloor spreading occurs, it pushes the underground magma up though the new crust, creating a sort of volcano out of the new crust. Magma is a very important part in seafloor spreading. :]
Seafloor spreading at midoceanic ridges.
Seafloor Spreading
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The typical rates of seafloor spreading is 5 centimeters per year. Seafloor spreading is a process that occurs at mid ocean ridges.