In 1971, 73 percent of members of Congress were veterans, but veterans made up fewer than 15 percent of the American population. Ten years later, 62 percent of Congress had served in the military, while just 12 percent of the population were veterans.
Perhaps it is the time old saying, Eat your crust!. The earth's crust is a little different then the crust on a piece of bread. It is not soft and chewy, but it hard and composed of different minerals. The thin, outermost layer of the earth is called the crust. It makes up only one percent of the earth's mass. The continental crust is thicker than the oceanic crust. It can range from 25 km thick at the edges to 70 km thick near the center.
The Earth has many layers. The three main layers of the Earth are: The crust (The outermost layer of the Earth). The mantle (Middle layer of the Earth) and. The core (Inner layers of the Earth). The crust is the outermost layer of the Earth and the thinnest of the layers. The Earth's crust is where the mountains, hills, valleys, plains, lakes and oceans are formed. The mantle is the largest layer of the Earth. The mantle is much hotter than the crust, just as the core is much hotter than the mantle.