SUPPLY CHAIN DEFINITIONS. Definitions of a supply chain virtually universally encompass the following three functions: i. supply of materials to a manufacturer; ii. the manufacturing process; and, iii. the distribution of finished goods through a network of distributors and retailers to a final customer.
The thickest parts are under the continents and the thinnest parts are under the oceans. Crust. Earth's crust is made up of several elements: oxygen, 47 percent; silicon, 27 percent; aluminum, 8 percent; iron, 5 percent; calcium, 4 percent; magnesium, potassium and sodium, 2 percent. The crust is divided into huge plates that float on the mantle, the next layer.
1 The crust is made up of silicate rocks such as granite and basalt. 2  The continental crust is much thicker than the oceanic crust as shown here in the diagram of the earth's crust. 3  Oceanic crust-The crust under the oceans is about 10 km thick and is generally made up of rock rich in iron and magnesium. Continental crust (continental cratons) - Where there are continents the crust is about 30 to 50 km thick. 2  It is made up of igneous, metamorphic, and sedimentary rocks. 3  The continental crust is less dense than the oceanic crust.