* Gabbro: A coarse-grained igneous rock that forms from cooled magma deep within the Earth.
* Peridotite: A dense, dark-colored rock rich in magnesium and iron, found in the upper mantle.
* Sediments: Layers of sand, silt, and clay deposited on the ocean floor.
Here's a breakdown of the composition:
* Basalt: Makes up the majority of the ocean crust, forming through volcanic activity at mid-ocean ridges.
* Gabbro: Found beneath the basalt layer, forming from magma that cools and solidifies slowly.
* Peridotite: Found in the uppermost mantle layer below the ocean crust, it is the source material for basalt and gabbro.
* Sediments: Varying thicknesses of sediment cover the ocean crust, accumulating over millions of years.
Key Features of Ocean Crust:
* Thin: Ocean crust is much thinner than continental crust (averaging about 5 km thick).
* Dense: Due to its basalt composition, ocean crust is denser than continental crust.
* Younger: Ocean crust is constantly being formed at mid-ocean ridges and destroyed at subduction zones, making it much younger than continental crust.
