By determining the age of rock samples obtained by drilling on the sea floor.
Its oceanic crust
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Scientists discovered that rocks farther away from the mid-ocean ridge were older than those near it through radiometric dating of the rocks. By measuring the age of the minerals within the rocks, they found that the farther rocks were older because they had been slowly moving away from the ridge as new crust formed at the ridge and pushed older crust farther out.
Scientists discovered that rocks farther away from the mid-ocean ridge were older through radiometric dating of the rocks. By analyzing the age of the minerals within the rocks, researchers found that the rocks closest to the ridge were younger, while those farther away were older, supporting the theory of seafloor spreading.
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Sediment closer to a mid-ocean ridge is typically younger, thinner, and composed of more volcanic material compared to sediment farther away. This is because the ridge is a site of active seafloor spreading where new oceanic crust is formed, leading to a higher rate of sedimentation near the ridge.
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The farther away the rocks are, the older they are. When the lava bubbles up from the ridge, the tectonic plates move outward. As the process repeates itself and new lava comes up, the rocks are pushed farther and father away. As a result, the closest rocks are the newest, and the farthest rocks are the oldest!
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The evidence that rocks farther from a ridge are older than rocks closer to the ridge supports the idea of sea floor spreading because it aligns with the concept of a divergent boundary where new oceanic crust is continuously formed at the ridge and gradually moves away from the ridge over time. This process allows for the creation of age gradients in the oceanic crust, with the youngest rocks found near the ridge and progressively older rocks located farther away.
No, the mid-ocean ridge is actually where new oceanic crust is formed through volcanic activity. As the crust moves away from the ridge, it becomes older. The oldest oceanic crust is found near the edges of the ocean basins.
Yes, the sea floor near the mid-ocean ridge is young. As magma rises along the ridge, it solidifies to form new crust, creating a continuous process of crust formation and pushing older crust away from the ridge. This results in the oldest sea floor being farthest from the mid-ocean ridges.