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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
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 and Roll Hall of Fame and Museum - Encyclopedia Britannica Rock and Roll Hall of Fame and Museum, museum and hall of fame in Cleveland that celebrates the history and cultural significance of rock music and honors the contributions of those who have played an important role in the music’s creation and dissemination
Rock and roll | History, Songs, Artists, Facts | Britannica Rock and roll, style of popular music that originated in the United States in the mid-1950s and that evolved by the mid-1960s into the more encompassing international style known as rock music, though the latter also continued to be known as rock and roll Learn more about the history of rock and roll in this article
United States | History, Map, Flag, Population | Britannica The United States is a country in North America that is a federal republic of 50 states Besides the 48 conterminous states that occupy the middle latitudes of the continent, the United States includes the state of Alaska, at the northwestern extreme of North America, and the island state of Hawaii, in the mid-Pacific Ocean
Plate tectonics | Definition, Theory, Facts, Evidence | Britannica Plate tectonics, theory dealing with the dynamics of Earth’s outer shell that revolutionized Earth sciences by providing a uniform context for understanding mountain-building processes, volcanoes, and earthquakes as well as the evolution of Earth’s surface and reconstructing its past continents and oceans
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
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
Lewis and Clark Expedition - Encyclopedia Britannica Lewis and Clark Expedition, U S military expedition (1804–06), led by Capt Meriwether Lewis and Lieut William Clark, to explore the Louisiana Purchase and the Pacific Northwest The expedition was a major chapter in the history of American exploration