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Rhenium has one stable isotope, rhenium-185, which nevertheless occurs in minority abundance, a situation found only in two other elements (indium and tellurium). Naturally occurring rhenium is only 37.4% 185 Re, and 62.6% 187 Re, which is unstable but has a very long half-life (~10 10 years).
This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Newton County, Arkansas, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map. [1]
Hampson Archeological Museum State Park is a 5-acre (2.0 ha) Arkansas state park in Mississippi County, Arkansas in the United States. The museum contains a collection of archeological artifacts from the Nodena site , which is a former Native American village on the Mississippi River between 1400 and 1650.
The location of the state of Arkansas. Paleontology in Arkansas refers to paleontological research occurring within or conducted by people from the U.S. state of Arkansas. The fossil record of Arkansas spans from the Ordovician to the Eocene. [1] Nearly all of the state's fossils have come from ancient invertebrate life. [1]
Initially, Arkansas bauxite met 90% of US aluminum demand. Underground mining before and during World War II gave way to open pit mining in the 1960s. During the war, up to six million tons were mined in 1943. Arkansas bauxite mines were often passed over in favor of higher quality bauxite reserves in the Caribbean and mining ceased in 1982.
The Jones Mill Site, designated by the Smithsonian trinomial 3HS28, is a prehistoric archaeological site near Jones Mill in Hot Spring County, Arkansas.It is a deeply stratified site, with evidence of human habitation in at least three different time periods.
Etzanoa is a historical city of the Wichita people, located in present-day Arkansas City, Kansas, near the Arkansas River, that flourished between 1450 and 1700. [1] Dubbed "the Great Settlement" by Spanish explorers who visited the site, Etzanoa may have housed 20,000 Wichita people. [2] The historical city is considered part of Quivira. [3]
The National Historic Landmarks in Arkansas represent Arkansas's history from the Louisiana Purchase through the Civil War and the Civil Rights Movement. It contains the landmarks designated by the U.S. Federal Government for the U.S. state of Arkansas. There are 17 National Historic Landmarks (NHLs) in Arkansas.