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Snowflake

2015-03-12 20:13:00
Snowflake |  görsel 1
Snowflake |  görsel 2
Snowflake |  görsel 3

A snowflake is either a single ice crystal or an aggregation of ice crystals which falls through the Earth's atmosphere. They begin assnow crystals which develop when microscopic supercooled cloud droplets freeze. Snowflakes come in a variety of sizes and shapes. Complex shapes emerge as the flake moves through differing temperature and humidity regimes, such that individual snowflakes are nearly[clarification needed] unique in structure. Snowflakes encapsulated in rime form balls known as graupel. Snowflakes appear white in color despite being made of clear ice. This is due to diffuse reflection of the whole spectrum of light by the small crystal facets. In warmer clouds an aerosol particle or "ice nucleus" must be present in (or in contact with) the droplet to act as a nucleus. The particles that make ice nuclei are very rare compared to nuclei upon which liquid cloud droplets form; however, it is not understood what makes them efficient. Clays, desert dust and biological particles may be effective. although to what extent is unclear. Artificial nuclei include particles of silver iodide and dry ice, and these are used to stimulate precipitation in cloud seeding. Once a droplet has frozen, it grows in the supersaturated environment, which is one where air is saturated with respect to ice when the temperature is below the freezing point. The droplet then grows by deposition of water molecules in the air (vapor) onto the ice crystal surface where they are collected. Because water droplets are so much more numerous than the ice crystals due to their sheer abundance, the crystals are able to grow to hundreds of micrometers or millimeters in size at the expense of the water droplets. This process is known as the Wegener–Bergeron–Findeisen process. The corresponding depletion of water va... Devamı

Endonezya'da yanardağ patladı

2014-02-24 21:31:00
Endonezyada yanardağ patladı |  görsel 1

Endonezya’da bulunan Sinaburg yanardağının patlaması sonucu aralarında çocuklarında bulunduğu 11 kişi hayatını kaybetti.   Patlama sonrası bölgeyi dumanlar kaplarken yetkililer 8 kişinin de yaralandığını belirtti. Sinaburg Dağı'nda geçtiğimiz eylül ayından beri meydana gelen patlamalarda 30 binden fazla kişi evlerinden ayrılmak zorunda kalmıştı.   2460 metrelik Sinaburg Dağı 2010 yılında meydana gelen patlama öncesi 400 yıl boyunca faaliyete geçmemişti. Devamı