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Petrified Forest National Park

(Encyclopedia)Petrified Forest National Park, 93,533 acres (37,881 hectares), E Ariz.; est. as a national monument 1906, designated a national park 1962. A part of the Painted Desert, it contains the largest known ...

phosphoric acid

(Encyclopedia)phosphoric acid, any one of three chemical compounds made up of phosphorus, oxygen, and hydrogen (see acids and bases). The most common, orthophosphoric acid, H3PO4, is usually simply called phosphori...

Arrokoth

(Encyclopedia)Arrokoth, trans-Neptunian object in the Kuiper Belt (see comet). First observed by the Hubble Space Telescope in 2014 and later nicknamed Ultima Thule (until its official naming in late 2019), it beca...

Manlius

(Encyclopedia)Manlius mănˈlēəs [key], ancient Roman gens, chiefly patrician but later containing plebeian families. Marcus Manlius Capitolinus, d. 384? b.c., consul (392 b.c.), took refuge in the Capitol when R...

Eyzies-de-Tayac, Les

(Encyclopedia)Eyzies-de-Tayac, Les lā zāzēˈ-də-tīäkˈ [key], or Les Eyzies, village, Dordogn...

Everest, Mount

(Encyclopedia)Everest, Mount ĕvˈərĭst, ĕvˈrəst [key], peak, 29,032 ft (8,849 m) high (as officially recognized by China and Nepal; rock height only, 29,016 ft/8,844 m), on the border of Tibet and Nepal, in t...

stucco

(Encyclopedia)stucco stŭkˈō [key], in architecture, a term loosely applied to various kinds of plasterwork, both exterior and interior. It now commonly refers to a plaster or cement used for the external coating...

Bamian

(Encyclopedia)Bamian or Bamiyan both: bəmyänˈ [key], town, capital of Bamian prov., N central Afghanistan, on the Kunduz ...

moraine

(Encyclopedia)moraine mərānˈ [key], a formation composed of unsorted and unbedded rock and soil debris called till, which was deposited by a glacier. The till that falls on the sides of a valley glacier from the...

geode

(Encyclopedia)geode jēˈōd [key], hollow, globular rock nodule ranging in diameter from 1 to 12 in. (2.54–30.5 cm) or more. Most geodes are partly filled with mineral matter; they have a thin layer of chalcedon...