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.
An igneous rock formed when magma is extruded onto Earth's surface where it cools and crystallizes , or when pyroclastic materials become consolidated. Igneous rocks make up ____ of continents and ____ of the oceanic crust.