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joint, in geology

(Encyclopedia)joint, in geology, fracture in rocks along which no appreciable movement has occurred (see fault). Nearly vertical, or sheet, joints that result from shrinkage during cooling are commonly found in ign...

sandstone

(Encyclopedia)sandstone, sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness of sandstone va...

Fletcher, John Gould

(Encyclopedia)Fletcher, John Gould, 1886–1950, American poet, b. Little Rock, Ark., educated (1903–7) at Harvard. After traveling throughout Europe, he became a leader of the imagists in England. His early coll...

Arches National Park

(Encyclopedia)Arches National Park, 76,519 acres (30,979 hectares), E Utah; est. as a national monument 1929, designated a national park 1971. Located in red-rock country and overlooking the gorge of the Colorado R...

Tiruchirapalli

(Encyclopedia)Tiruchirapalli trĭchĭnŏˈpəlē [key], city (1991 pop. 711,862), Tamil Nadu state, SE India, on the Kaveri River. It is a district administrative center and an important educational, religious, and...

Pennebaker, D. A.

(Encyclopedia)Pennebaker, D. A. (Donn Alan Pennebaker), 1925–2019, pioneering documentary filmmaker, b. Evanston, Ill. His first film, Daybreak Express (1958), is a five-minute short detailing New York's doomed T...

Meghalaya

(Encyclopedia)Meghalaya māˌgəlāˈyə [key], state (2001 provisional pop. 2,306,069), c.8,700 sq mi (22,530 sq km), NE India, bordered on the south by Bangladesh. The capital is Shillong. Meghalaya is in the Gar...

White Horse, Vale of the

(Encyclopedia)White Horse, Vale of the, district (1991 pop. 109,200), Oxfordshire, S central England. The vale is the valley of the Ock River. Abingdon is the administrative seat. Surgical instruments and automobil...

Graves, William Sidney

(Encyclopedia)Graves, William Sidney, 1865–1940, American army officer, b. Hill co., Tex., grad. West Point, 1889. He served (1899–1901) in the Philippines and commanded (1918–20) American forces in Siberia. ...

Punchbowl

(Encyclopedia)Punchbowl, hill, 500 ft (152 m) high, in the city of Honolulu, SE Oahu island, Hawaii. In the bowllike extinct volcanic crater at the summit (reached by a scenic drive) is the National Memorial Cemete...