Parent Material

In soil science, parent material is the underlying geological material (generally bedrock or a superficial or drift deposit) in which soil horizons form. Soils typically inherit a great deal of structure and minerals from their parent material, and, as such, are often classified based upon their contents of consolidated or unconsolidated mineral material that has undergone some degree of physical or chemical weathering and the mode by which the materials were most recently transported.

Read more about Parent Material:  Consolidated, Unconsolidated, Climate and Weathering

Famous quotes containing the words parent and/or material:

    The children [on TV] are too well behaved and are reasonable beyond their years. All the children pop in with exceptional insights. On many of the shows the children’s insights are apt to be unexpectedly philosophical. The lesson seems to be, “Listen to little children carefully and you will learn great truths.”
    —G. Weinberg. originally quoted in “What Is Television’s World of the Single Parent Doing to Your Family?” TV Guide (August 1970)

    We have imagined ourselves a special creation, set apart from other humans. In the last twentieth century, we see that our poverty is as absolute as that of the poorest nations. We have attempted to deny the human condition in our quest for power after power. It would be well for us to rejoin the human race, to accept our essential poverty as a gift, and to share our material wealth with those in need.
    Robert Neelly Bellah (20th century)