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Chimney Rock National Historic Site - Encyclopedia Britannica Chimney Rock National Historic Site, spirelike sandstone rock formation in western Nebraska, U S , that was a major landmark along the Oregon Trail It is located about 3 miles (5 km) south of Bayard and consists of a 120-foot (37-metre) needle atop a cone-shaped mound; in all, the formation rises
Rock | Definition, Characteristics, Formation, Cycle, Classification . . . Rock, in geology, naturally occurring and coherent aggregate of one or more minerals Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes The three major classes of rock are igneous, sedimentary, and metamorphic rock
Rock | Definition, History, Artists, Songs, Facts | Britannica Rock is a form of popular music that emerged in the 1950s and that by the end of the 20th century was the world’s dominant form of popular music It originated in the United States and spread to other English-speaking countries and across Europe in the 1960s
Sedimentary rock | Definition, Formation, Examples, Characteristics . . . Sedimentary rock, rock formed at or near Earth’s surface by the accumulation and lithification of sediment or by the precipitation from solution at normal surface temperatures Sedimentary rocks are the most common rocks exposed on Earth’s surface but are only a minor constituent of the entire crust
Metamorphic rock | Definition, Formation, Facts | Britannica Metamorphic rock, any rock that results from the alteration of preexisting rocks in response to changing conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks
rock - Kids | Britannica Kids | Homework Help Rock, or stone, is a hard material made up of one or more minerals Rock makes up the outer layer of Earth, called the crust The lower parts of this layer are solid rock, or…
Igneous rock | Characteristics, Examples, Formation, Types | Britannica Igneous rock, any of various crystalline or glassy rocks formed by the cooling and solidification of magma, which is a hot (600 to 1,300 °C, or 1,100 to 2,400 °F) molten or partially molten rock Igneous rocks constitute one of the three principal classes of rocks, the others being metamorphic and sedimentary
September 11 attacks - Encyclopedia Britannica September 11 attacks, series of airline hijackings and suicide attacks committed in 2001 by 19 militants associated with Islamic extremist group al-Qaeda against targets in the United States, the deadliest terrorist attacks on U S soil in U S history Over 3,000 people died in the attacks and rescue efforts
Rock - Structure, Texture, Composition | Britannica Rock - Structure, Texture, Composition: Physical properties of rocks are of interest and utility in many fields of work, including geology, petrophysics, geophysics, materials science, geochemistry, and geotechnical engineering The scale of investigation ranges from the molecular and crystalline up to terrestrial studies of the Earth and other planetary bodies Geologists are interested in
List of U. S. State Capitals | Britannica This is a list of the cities that are state capitals in the United States, ordered alphabetically by state The list also provides the most recent U S census population for each city as well as an estimated population (This list does not include the capital of the United States, Washington, D C )