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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 - 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…
Rock - Social Change, Cultural Evolution, Music Revolution | Britannica Rock - Social Change, Cultural Evolution, Music Revolution: How, then, should rock’s contribution to music history be judged? One way to answer this is to trace rock’s influences on other musics Another is to attempt a kind of cultural audit
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
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
felsic and mafic rocks - Encyclopedia Britannica Compilations of many rock analyses show that rhyolite and granite are felsic, with an average silica content of about 72 percent; syenite, diorite, and monzonite are intermediate, with an average silica content of 59 percent; gabbro and basalt are mafic, with an average silica content of 48 percent; and peridotite is an ultramafic rock, with an
Igneous rock - Minerals, Magma, Crystals | Britannica Igneous rock - Minerals, Magma, Crystals: The major mineralogical components of igneous rocks can be divided into two groups: felsic (from feldspar and silica) and mafic (from magnesium and ferrous iron)