What are parent materials?

Some articles on parent materials:

Entisol - Causes of Delayed or Absent Development
... Unweatherable parent materials - sand, iron oxide, aluminium oxide, kaolinite clay ... Deposition - continuous, repeated deposition of new parent materials by water, wind, colluvium, mudflows, other means ... Toxic parent materials - serpentine soil, mine spoils, sulfidic clays ...

Famous quotes containing the words materials and/or parent:

    Kicking his mother until she let go of his soul
    Has given his a healthy appetite: clearly, her role
    In the New Order must be
    To supply and deliver his raw materials free;
    —W.H. (Wystan Hugh)

    Obedience is the mother of success, and success the parent of salvation.
    Aeschylus (525–456 B.C.)