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安裝中文字典英文字典辭典工具!
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- list of presidents of the United States - Encyclopedia Britannica
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 limited to a maximum of two terms Click on a president below to learn more about each presidency
- Metamorphic rock | Definition, Formation, Facts | Britannica
Metamorphic rock, any rock that results from the alteration of preexisting rocks in response to changing conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks
- Igneous rock | Characteristics, Examples, Formation, Types | Britannica
Igneous rock, any of various crystalline or glassy rocks formed by the cooling and solidification of magma, which is a hot (600 to 1,300 °C, or 1,100 to 2,400 °F) molten or partially molten rock Igneous rocks constitute one of the three principal classes of rocks, the others being metamorphic and sedimentary
- Jack White | Biography, Music, Facts | Britannica
Jack White (born July 9, 1975, Detroit, Michigan, U S ) is an American guitarist, singer, and songwriter who first gained fame with the White Stripes and later performed in other bands before launching a successful solo career Gillis, the youngest of 10 children in a Polish Scottish family, grew up in Detroit His father worked as a maintenance man and his mother as a secretary, both for the
- Rock, Massachusetts, Colony, Map, History, Facts - Britannica
Plymouth, town (township), Plymouth county, southeastern Massachusetts, U S It lies on Plymouth Bay, 37 miles (60 km) southeast of Boston It was the site of the first permanent settlement by Europeans in New England, Plymouth colony, known formally as the colony of New Plymouth The town was founded by Pilgrims (Separatists from the Church of England) who, in their search for religious
- Linda Ronstadt | Biography, Albums, Songs, Facts | Britannica
Linda Ronstadt (born July 15, 1946, Tucson, Arizona, U S ) is an 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 music After winning attention with a folk-oriented trio, the Stone Poneys, in California in the mid-1960s, Ronstadt embarked upon a solo career
- Rocky Mountains | Location, Map, History, Facts | Britannica
Rocky Mountains, mountain range forming the cordilleran backbone of the great upland system that dominates the western North American continent Generally, the ranges included in the Rockies stretch from northern Alberta and British Columbia southward to New Mexico, a distance of some 3,000 miles (4,800 km) In places the system is 300 or more miles wide
- Standing Rock protests | Summary, Violence, Outcome | Britannica
The Standing Rock protests were a campaign undertaken in North Dakota in 2016 and 2017 to halt the construction of the Dakota Access pipeline Early resistance to the pipeline was launched by members of the Standing Rock Sioux Tribe, but over time the demonstrations drew thousands of supporters from all across the United States
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