SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Fossilized evidence of similar plants and animals on different continents with much different climates.
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Paleomagnetism showing there is a pattern of magnetic rock with reversals approximately every one million years.
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At the midocean ridge the rock is younger than rock further away from the ridge.
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All of these are evidence that the plates are moving and the sea floor is spreading.
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Detailed explanation-1: -Seafloor spreading disproves an early part of the theory of continental drift. Supporters of continental drift originally theorized that the continents moved (drifted) through unmoving oceans. Seafloor spreading proves that the ocean itself is a site of tectonic activity.
Detailed explanation-2: -Seismic studies. More proof for sea floor spreading comes from seismic studies indicating that earthquakes occur along the rift valley of a midoceanic ridge and the crossâcutting fractures that offset it.
Detailed explanation-3: -Supporting Evidence for Seafloor Spreading First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.
Detailed explanation-4: -Seafloor spreading was proposed by an American geophysicist, Harry H. Hess in 1960. By the use of the sonar, Hess was able to map the ocean floor and discovered the mid-Atlantic ridge (mid-ocean ridge). He also found out that the temperature near to the mid-Atlantic ridge was warmer than the surface away from it.