Definition of marriage. 1  1a see usage paragraph below : the state of being united as spouses in a consensual and contractual relationship recognized by lawb : the mutual relation of married persons : wedlockc : the institution whereby individuals are joined in a marriage.
The majority of the surface rocks on the North American continent are sedimentary. The mountainous regions of the west and southwest are made of igneous rocks. The Appalachian Mountain region of the eastern U.S. and most of eastern Canada are made of metamorphic rocks.
Igneous rocks are commonly classified by their composition and texture. Most are composed of the eight most abundant elements in the Earth's crust. Because of the dominance of oxygen and silicon in the crust, igneous rocks are mostly made up of silicate minerals.These silicates can be generally divided into light and dark silicates.ost are composed of the eight most abundant elements in the Earth's crust. Because of the dominance of oxygen and silicon in the crust, igneous rocks are mostly made up of silicate minerals. These silicates can be generally divided into light and dark silicates.