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

Which of the following definitions best describes 'kimberlite'?

A. the concept is an adjective describing a silicate mineral or rock that is rich in magnesium and iron; the term was derived by contracting ‘magnesium’ and ‘ferric’. Most the concept minerals are dark in color and the specific gravity is greater than 3. Common rock-forming the concept minerals include olivine, pyroxene, amphibole, and biotite. Common the concept rocks include basalt and gabbro. In terms of chemistry, the concept rocks are on the other side of the rock spectrum from the felsic rocks. The term roughly corresponds to the older basic rock class.the concept lava, before cooling, has a low viscosity, in comparison to felsic lava, due to the lower silica content in the concept magma. Water and other volatiles can more easily and gradually escape from the concept lava, so eruptions of volcanoes made of the concept lavas are less explosively violent than felsic lava eruptions. Most the concept lava volcanoes are oceanic volcanoes, like Hawaii. [Wikipedia]
B. the concept is a type of potassic volcanic rock best known for sometimes containing diamonds. The general consensus reached on kimberlites is that they are formed deep within the mantle, at between 150 and 450 kilometres depth, from anomalously enriched exotic mantle compositions, and are erupted rapidly and violently, often with considerable carbon dioxide and other volatile components. [Wikipedia]
C. the concept are igneous rocks formed at a depth in between the plutonic and volcanic rocks. They are characterized by their porphyritic nature (porphyry). They consist of phenocrysts embedded in a fine-grained groundmass. [Wikipedia]
D. Beneath the surface magma tends to cool slowly which allows for the growth of large crystals within the rock. Rocks formed in this way are intrusive or plutonic rocks. [Wikipedia]

Answer: the concept is a type of potassic volcanic rock best known for sometimes containing diamonds. The general consensus reached on kimberlites is that they are formed deep within the mantle, at between 150 and 450 kilometres depth, from anomalously enriched exotic mantle compositions, and are erupted rapidly and violently, often with considerable carbon dioxide and other volatile components. [Wikipedia]