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Mudbrick or mud-brick, also known as unfired brick, is an air-dried brick, made of a mixture of mud (containing loam, clay, sand and water) mixed with a binding material such as rice husks or straw. Mudbricks are known from 9000 BCE. From around 5000–4000 BCE, mudbricks evolved into fired bricks to increase strength and durability.
FIRST LEGO League Explore is designed to be a non-competitive and community-based program. The teams are formed within local community and participate in local events. FIRST provides guidelines to help coaches to run their teams and local organizers to run FLLE events. However, FIRST does not organize any FLLE events, unlike other FIRST programs.
Bronze. Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals (including aluminium, manganese, nickel, or zinc) and sometimes non-metals, such as phosphorus, or metalloids, such as arsenic or silicon. These additions produce a range of alloys that may be harder than ...
Starting from the late Bronze Age, a peculiar type of circular structure with a central basin and benches located all around the circumference of the room start to appear in Nuragic settlements, the best example of this type of structure is the ritual fountain of Sa Sedda e Sos Carros, near Oliena, where thanks to a hydraulic implant of lead ...
Sican tumi, or ceremonial knife, Peru, 850–1500 CE. Metallurgy in pre-Columbian America is the extraction, purification and alloying of metals and metal crafting by Indigenous peoples of the Americas prior to European contact in the late 15th century. Indigenous Americans had been using native metals from ancient times, with recent finds of ...
The Minoan and Mycenaean (Middle to Late Aegean Bronze Age) swords are classified in types labeled A to H following Sandars (1961, 1963), the "Sandars typology". Types A and B ("tab-tang") are the earliest from about the 17th to 16th centuries, types C ("horned" swords) and D ("cross" swords) from the 15th century, types E and F ("T-hilt" swords) from the 13th and 12th.
Ringfort. The Grianán Ailigh in County Donegal, Ireland, is one of the more impressive stone-walled ringforts. Ringforts or ring forts are small circular fortified settlements built during the Bronze Age, Iron Age and early Middle Ages up to about the year 1000 AD. They are found in Northern Europe, especially in Ireland.
Figuratively, patina can refer to any fading, darkening, or other signs of age, which are felt to be natural or unavoidable (or both). The chemical process by which a patina forms or is deliberately induced is called patination, and a work of art coated by a patina is said to be patinated . Copper weather vane with verdigris patina.
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