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List of presidents of the United States | U. S. Presidents, Presidential . . . As the head of the government of the United States, the president is arguably the most powerful government official in the world The president is elected to a four-year term via an electoral college system Since the Twenty-second Amendment was adopted in 1951, the American presidency has been
Weathering | Physical, Chemical Biological Effects | Britannica Weathering, disintegration or alteration of rock in its natural or original position at or near the Earth’s surface through physical, chemical, and biological processes induced or modified by wind, water, and climate During the weathering process the translocation of disintegrated or altered
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…
Encyclopedia Britannica | Britannica Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts
Rock - Structure, Texture, Composition | Britannica Rock - Structure, Texture, Composition: Physical properties of rocks are of interest and utility in many fields of work, including geology, petrophysics, geophysics, materials science, geochemistry, and geotechnical engineering The scale of investigation ranges from the molecular and crystalline up to terrestrial studies of the Earth and other planetary bodies Geologists are interested in
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
Rod Stewart | Biography, Songs, Facts | Britannica Rod Stewart is a British singer and songwriter whose soulful, raspy voice graced rock and pop hits beginning in the late 1960s He first gained fame as a member of the Faces His best-known songs include ‘Maggie May’ and ‘You Wear It Well ’
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 (What is the ratio of rock masterworks to rock dross?) But such approaches come up against the problem of definition Rock does not so much
Linda Ronstadt | Biography, Albums, Songs, Facts | Britannica Linda Ronstadt, American singer, with a pure, expressive soprano voice and eclectic artistic tastes, whose performances called attention to a number of new songwriters and helped establish country rock Heart Like a Wheel (1974) was the first of several successful albums Learn more about her life and career
The Doobie Brothers | Members, Songs, Albums, Facts | Britannica The Doobie Brothers were an American rock band whose shift from Southern rock and blues-inspired compositions toward a commercially appealing soft rock sound resulted in its relevance and popularity throughout the 1970s and early 1980s