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.
Basalt is the most abundant igneous rock in the Earths crust. Most of the ocean floor is underlain by basalt. It is a volcanic igneous rock, and is typically dark in color because it contains large amounts of iron (Fe) and magnesium (Mg) compared to other igneous rocks.