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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
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
Rock - 1960s, British Invasion, Psychedelic | Britannica The Beatles’ success suggested that it was possible to enjoy the commercial, mass-cultural power of rock and roll while remaining an artist The immediate consequence was folk rock Folk musicians, led by Bob Dylan, went electric, amplified their instruments, and sharpened their beat
Metamorphic rock | Definition, Formation, Facts | Britannica Metamorphism can occur either when a rock moves from one position to another along a single geotherm or when the geotherm itself changes form The former can take place when a rock is buried or uplifted at a rate that permits it to maintain thermal equilibrium with its surroundings
Rock - Social Change, Cultural Evolution, Music Revolution | Britannica Rock remains the most democratic of mass media—the only one in which voices from the margins of society can still be heard out loud Yet, at the beginning of the 21st century, rock and the music industry faced a new crisis
Heavy metal | Bands, Songs, Music, Rock, Facts | Britannica Rock music is a form of popular music that emerged in the 1950s and can be defined as “a form of music with a strong beat”—it is difficult to be much more precise It is also called rock and roll
Rock and Roll Hall of Fame and Museum - Encyclopedia 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
Sedimentary rock - Mudrocks, Clastic Rocks, Stratification | Britannica Sedimentary rock - Mudrocks, Clastic Rocks, Stratification: In terms of volume, mudrocks are by far the most important variety of sedimentary rock, probably constituting nearly 80 percent of Earth’s sedimentary rock column