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2 total sentences available.
It is known as gabbro and is thought to form the lower layer of the oceanic crust at about four kilometres depth and to comprise a layer up to six kilometres thick, making it one of the most abundant, if least recognisable, materials on earth.
Source: wiktionary
Against the dark Ordovician gabbro, the black volcanic base, Rhynie is a streak of technicolour.
Source: wiktionary