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Bookmark or Share- Rock | Definition, History, Artists, Songs, & Facts | Britannicarock, form of popular music that emerged in the 1950s.. It is certainly arguable that by the end of the 20th century rock was the world’s dominant form of popular music. Originating in the United States in the 1950s, it spread to other English-speaking countries and across Europe in the ’60s, and by the ’90s its impact was obvious globally (if in many different local guises).
- Geologic time | Periods, Time Scale, & Facts | BritannicaThe geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration— eons, eras, periods, epochs, and ages.The enumeration of those geologic time units is based on stratigraphy, which is the correlation and classification of rock strata. The fossil forms that occur in the rocks, however ...
- Sedimentary rock | Definition, Formation, Examples, & Characteristics ...sedimentary rock, rock formed at or near Earth’s surface by the accumulation and lithification of sediment (detrital rock) or by the precipitation from solution at normal surface temperatures (chemical rock). Sedimentary rocks are the most common rocks exposed on Earth’s surface but are only a minor constituent of the entire crust, which is dominated by igneous and metamorphic rocks.
- 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. Rocks are commonly divided into three major classes according to the processes that resulted in their formation. These classes are (1) igneous rocks, which have solidified from ...
- Lorelei | Mythology & Meaning | BritannicaLorelei, German legend of a beautiful maiden who threw herself into the Rhine River in despair over a faithless lover and was transformed into a siren who lured fishermen to destruction. The myth is associated with a large rock named Lorelei, which stands on the bank of the Rhine River near Sankt Goarshausen, Germany, and is known for producing an echo.
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