Apr 8, 2026 · 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 …

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 …

3 days ago · Dwayne Johnson is an American professional wrestler and actor whose charisma and athleticism have made him a success in both fields. His popular films include several installments of …

Rock - 1960s, British Invasion, Psychedelic: Whatever the commercial forces at play (and despite the continuing industry belief that this was pop music as transitory novelty), it became clear that the most …

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. …

Rock - Pioneers, Genres, Legends: For lexicographers and legislators alike, the purpose of definition is to grasp a meaning, to hold it in place, so that people can use a word correctly—for example, to …

Punk, aggressive form of rock music that coalesced into an international (though predominantly Anglo-American) movement in 1975–80. Often politicized and full of energy beneath a sarcastic, hostile …

Mar 21, 2026 · Art rock is an eclectic branch of rock music that emerged in the late 1960s and flourished in the early to mid-1970s. The term is sometimes used interchangeably with ‘progressive rock.’ …

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 …

Metamorphic rock can be formed from sedimentary or igneous rocks. Studying chemicals that make up metamorphic rock can reveal the original rock type. Limestone is a sedimentary rock that can be …