Most of this plagioclase-rich crust formed shortly after formation of the moon, between about 4.5 and 4.3 billion years ago.
Perhaps 10% or less of the crust consists of igneous rock added after the formation of the initial plagioclase-rich material.
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Some zircon with age as great as 4.3 billion years has been found in the Narryer Gneiss Terrane.
A theoretical protoplanet named "Theia" is thought to have collided with the forming Earth, and part of the material ejected into space by the collision accreted to form the Moon.
The boundary between the crust and mantle is conventionally placed at the Mohorovi? discontinuity, a boundary defined by a contrast in seismic velocity.
The crust occupies less than 1% of Earth's volume. The oceanic crust of the sheet is different from its continental crust.
You may notice as a member that we have many women in various stages of pregnancy on the site.The oceanic crust is 5 km (3 mi) to 10 km (6 mi) thick and is composed primarily of basalt, diabase, and gabbro.