Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'diagenesis'?

A. In geology and oceanography, the concept is any chemical, physical, or biological change undergone by a sediment after its initial deposition and during and after its lithification, exclusive of surface alteration (weathering) and metamorphism. These changes happen at relatively low temperatures and pressures and result in changes to the rock's original mineralogy and texture. The boundary between the concept and metamorphism, which occurs under conditions of higher temperature and pressure, is gradational. After deposition, sediments are compacted as they are buried beneath successive layers of sediment and cemented by minerals that precipitate from solution. Grains of sediment, rock fragments and fossils can be replaced by other minerals during the concept. Porosity usually decreases during the concept, except in rare cases such as dissolution of minerals and dolomitization.
B. The process of depositing soil or sediments by a river or other running water. [Wikipedia]
C. In the United States, NOAA the concept operations does not include superstructure icing as being the concept. In the concept operations however, the concept is any form of ice found at sea which has originated from the freezing of sea water. It presents the main kind of floating ice encountered at sea. Except where it forms ridges, the concept is up to a few metres thick, in which respect it differs from shelf ice. the concept may be discontinuous pieces (ice floes) moved on the ocean surface by wind and currents (pack ice), or a motionless sheet attached to the coast (land-fast ice). In brief, it forms first as lolly ice (frazil crystals), thickens into sludge, and coagulates into sheet ice, pancake ice, or into floes of various shapes and sizes. Thereafter, the concept may develop into pack ice and/or become a form of pressure ice. the concept less than one year old is called first-year ice. Perennial ice is the concept that survives at least one summer. It may be subdivided into second-year ice and multi-year ice, where multiyear ice has survived at least two summers.
D. the concept, part of the process of lithification involving mechanical dewatering of a sediment by progressive loading under several km of geomaterial [Wikipedia]

Answer: In geology and oceanography, the concept is any chemical, physical, or biological change undergone by a sediment after its initial deposition and during and after its lithification, exclusive of surface alteration (weathering) and metamorphism. These changes happen at relatively low temperatures and pressures and result in changes to the rock's original mineralogy and texture. The boundary between the concept and metamorphism, which occurs under conditions of higher temperature and pressure, is gradational. After deposition, sediments are compacted as they are buried beneath successive layers of sediment and cemented by minerals that precipitate from solution. Grains of sediment, rock fragments and fossils can be replaced by other minerals during the concept. Porosity usually decreases during the concept, except in rare cases such as dissolution of minerals and dolomitization.