It is the outermost layer of the earth's surface. The Earth’s crust is its lightest, most buoyant rock layer. Continental crust covers 41% of the Earth’s surface, though a quarter of that area is under the oceans. The continental crust is 20 to 80 kilometers thick. Its rocks hold four billion years of Earth history. The remainder of the Earth is covered by oceanic crust. The crust is made of relatively light elements, especially silica, aluminum and oxygen. It’s also highly variable in its thickness. crust is made of relatively light elements, especially silica, aluminum and oxygen. It’s also highly variable in its thickness.
The civil service reform act of 1978 is intended to provide Federal managers with the flexibility to improve Government operations and productivity while, at the same time, protect employees from unfair or unwarranted practices.
America was named America after Amerigo Vespucci. Vespucci was an early explorer, who lived around the same time as Christopher Columbus.
