With increasing distance from the midocean ridge, the rocks become older as the mid-oceanic ridge is the actual site of seafloor spreading, and the rocks closest to it are thinner and newer.
The more the distance from the mid-oceanic ridge, the more is the age, thickness, and density of the oceanic crust. The process of seafloor spreading takes place at the mid-oceanic ridge. Here, the new oceanic crust is formed by volcanic activity and afterward, it moves away from the ridge.
The older rocks which are at a distance from the mid-oceanic ridge convert into magma while igneous rocks are formed at the ridge.
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