Search results
Results From The WOW.Com Content Network
Snow crystals form when tiny supercooled cloud droplets (about 10 μm in diameter) freeze. These droplets are able to remain liquid at temperatures lower than −18 °C (255 K; 0 °F), because to freeze, a few molecules in the droplet need to get together by chance to form an arrangement similar to that in an ice lattice; then the droplet ...
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. Quartz is, therefore, classified structurally as a framework silicate mineral and ...
References. [ 3][ 4][ 5] Graphite ( / ˈɡræfaɪt /) is a crystalline form of the element carbon. It consists of stacked layers of graphene. Graphite occurs naturally and is the most stable form of carbon under standard conditions. Synthetic and natural graphite are consumed on a large scale (1.3 million metric tons per year in 2022) for uses ...
Cape Town[ a] is the legislative capital of South Africa. It is the country's oldest city and the seat of the Parliament of South Africa. [ 11] It is the country's second-largest city, after Johannesburg, and the largest in the Western Cape. [ 12] The city is part of the City of Cape Town metropolitan municipality .
Tuff can be classified as either igneousor sedimentary rock. It is usually studied in the context of igneous petrology, although it is sometimes described using sedimentologicalterms. Tuff is often erroneously called tufa in guidebooks and in television programs but tufais a form of travertine. Volcanic ash.
Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including ( clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...
Continent. Animated, colour-coded map showing some continents and the region of Oceania (purple), which includes the continent of Australia. Depending on the convention and model, some continents may be consolidated or subdivided. A continent is any of several large geographical regions. Continents are generally identified by convention rather ...
The swastika symbol ( Lithuanian: sūkurėlis) is a traditional Baltic ornament, [ 115][ 178] found on relics dating from at least the 13th century. [ 179] The swastika for Lithuanians represent the history and memory of their Lithuanians ancestors as well as the Baltic people at large. [ 179]