- Stalactite and stalagmite | Cave formations, Limestone caves . . .
Stalactite and stalagmite, elongated forms of various minerals deposited from solution by slowly dripping water A stalactite hangs like an icicle from the ceiling or sides of a cavern A stalagmite appears like an inverted stalactite, rising from the floor of a cavern Stalactites hanging from the
- List of U. S. Cities | Britannica
The United States contains a highly diverse population Unlike a country such as China that largely incorporated Indigenous peoples, the United States has a diversity that to a great degree has come from immense and sustained global immigration Probably no other country has a wider range of racial, ethnic, and cultural types than does the United States
- California | Flag, Facts, Maps, Capital, Cities, Destinations . . .
The heartland of California is the Central Valley, which runs for 450 miles (725 km) through the center of the state, forming a trough between the Coast Ranges to the west and the Sierra Nevada to the east The valley is the state’s agricultural center Its single opening is the delta through which the Sacramento and San Joaquin rivers drain into San Francisco Bay
- Cave | Definition, Formation, Types, Facts | Britannica
cave, natural opening in the earth large enough for human exploration Such a cavity is formed in many types of rock and by many processes The largest and most common caves are those formed by chemical reaction between circulating groundwater and bedrock composed of limestone or dolomite These caves, called solution caves, typically constitute a component of what is known as karst terrain
- Permian Basin | Oil Gas, Texas, USA | Britannica
Permian Basin, large sedimentary basin in western Texas and southeastern New Mexico, U S , noted for its rich petroleum, natural gas, and potassium deposits Owing to its economic importance, it is one of the most well-studied geologic regions of the world Deposits of the Permian Basin are featured in Guadalupe Mountains National Park Although named for the Permian Period (299 million to
- Alcatraz Island | Facts, Escape, Native Americans, Map, History . . .
Alcatraz Island, also known as ‘The Rock,’ a rocky island in San Francisco Bay, off the coast of California, in the United States From 1934 to 1963, a facility on the island served as a federal prison for some of the most dangerous civilian prisoners Learn more about the history of Alcatraz Island here
- Did Anyone Escape from Alcatraz? - Encyclopedia Britannica
In 1937 Theodore Cole and Ralph Roe escaped into the bay after filing through the bars on a window Because there was a storm that night, making the bay especially hazardous, both men are believed to have drowned; nevertheless, their bodies were never found
- 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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