The lower oceanic crust is a layer of the Earth's crust that forms part of the oceanic lithosphere. It is typically situated beneath the upper oceanic crust and lies above the mantle. The oceanic crust has a distinct layered structure, which can generally be divided into three main layers: 1. **Layer 1**: This is the sedimentary layer, consisting mainly of sediments that have settled on the ocean floor, including clay, silt, and biogenic materials like shells.
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