36°26′N 128°10′E / 36.44°N 128.17°E
Sangju (Korean: 상주; Korean pronunciation: [sʰa̠ŋ.dʑu]) is a city in North Gyeongsang Province, South Korea. Although Sangju is rather rural, it is very old and was once a key city. Along with Gyeongju, it gives rise to half of the name of the Gyeongsang Provinces. Sangju is nicknamed Sam Baek, or "Three Whites", referring to three prominent agricultural products rice, silkworm cocoons, and dried persimmons from the area.
Conglomerate (/kənˈɡlɒmərət/) is a sedimentary rock made up of rounded gravel-sized pieces of rock surrounded by finer-grained sediments (such as sand, silt, or clay). The larger fragments within conglomerate are called clasts, while the finer sediment surrounding the clasts is called the matrix. The clasts and matrix are typically cemented by calcium carbonate, iron oxide, silica, or hardened clay.
Conglomerates form when rounded gravels deposited by water or glaciers become solidified and cemented by pressure over time. They can be found in sedimentary rock sequences of all ages but probably make up less than 1 percent by weight of all sedimentary rocks. They are closely related to sandstones in origin, and exhibit many of the same types of sedimentary structures, such as tabular and trough cross-bedding and graded bedding.
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