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Stonehenge in Wiltshire is a ring of stones, each about 4 m (13 ft) high, 2 m (7 ft) wide and 25 tonnes, erected 2400–2200 BC. Settlement by Cro-Magnons of what was to become the United Kingdom occurred in waves beginning by about 30,000 years ago. [ 60 ]
The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road). The imperial system of units, imperial system or imperial units (also known as British Imperial [1] or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.
Unit 4 + 2 released 10 singles on Decca between 1964 and 1967, including one four-track EP, and many of the songs ended up on 1st Album. [11] The album later changed in title, cover art and track listing and was re-released as #1 featuring Concrete and Clay .
A light-year, alternatively spelled light year ( ly or lyr[ 3] ), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km ( Scientific notation: 9.4607304725808 × 10 12 km), which is approximately 5.88 trillion mi.
The British thermal unit ( Btu) is a measure of heat, which is a form of energy. It was originally defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. It is also part of the United States customary units. [ 1] The SI unit for energy is the joule (J); one Btu equals about 1,055 J ...
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide).The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2.
The history of the Civil Aviation Flying Unit (CAFU) can be traced back to the Air Ministry's Civil Operations Fleet founded in 1944. The CAA and its predecessors have operated 49 aircraft of 13, primarily British, aircraft types including de Havilland Tiger Moths , Avro Ansons , Airspeed Consuls , Percival Princes , de Havilland Doves , [ 16 ...
Moissanite ( / ˈmɔɪsəˌnaɪt /) [ 5] is naturally occurring silicon carbide and its various crystalline polymorphs. It has the chemical formula SiC and is a rare mineral, discovered by the French chemist Henri Moissan in 1893. Silicon carbide or moissanite is useful for commercial and industrial applications due to its hardness, optical ...