Deposition (geology)

Deposition is the geological process in which sediments, soil and rocks are added to a landform or land mass. Wind, ice, and water, as well as sediment flowing via gravity, transport previously eroded sediment, which, at the loss of enough kinetic energy in the fluid, is deposited, building up layers of sediment.

Deposition occurs when the forces responsible for sediment transportation are no longer sufficient to overcome the forces of gravity and friction, creating a resistance to motion, this is known as the null-point hypothesis. Deposition can also refer to the buildup of sediment from organically derived matter or chemical processes. For example, chalk is made up partly of the microscopic calcium carbonate skeletons of marine plankton, the deposition of which has induced chemical processes (diagenesis) to deposit further calcium carbonate. Similarly, the formation of coal begins with deposition of organic material, mainly from plants, in anaerobic conditions.

Null-point hypothesis

Deposition

Deposition may refer to:

Deposition, in science, may refer to:

The Deposition can also refer to depictions of Christ's descent from the cross, as in:

Deposition (van Dyck, 1629-30)

The Deposition or Lamentation over the Dead Christ was a painting by the Flemish painter Anthony van Dyck, produced between 1629 and 1630. It measured 220 cm by 166 cm. Its final owners were the Kaiser Friedrich Museum then the Gemäldegalerie, Berlin, before it was lost (either missing or destroyed) in May 1945 in the Friedrichshain flak tower fire. A copy of the work is now in the Gedächtniskapelle of the Deutschordensmünster in Heilbronn.

References

Deposition (university)

The deposition (from Latin depositio cornuum, "taking off the horns") was a semi-official initiation ritual which was common at universities throughout Europe from the Middle Ages until the 18th century. The ritual was introduced at German universities in the late 15th century, probably from the influential University of Paris. Models may have included the Freisprechung ritual in artisan guilds, where apprentices were admitted to the status of journeymen.

Purpose

A basis for the deposition was the idea that the arriving student was still wild and unpolished before his immatriculation – like an animal – and had to be relieved of the signs of his uncivilised state before he could be accepted as part of the University. The student only had to go through the deposition once in his life; he would receive a deposition certificate ("Depositionsschein" in German) which he could show in case of transferring to another university.

The deposition consisted of scolding, in which the unworthiness of the new student would be clarified to him, in ritual removal of animal-like artificial body parts with the help of over-dimensioned tools, as well as beating and other abuse, which would have the function of a purification ritual.