Odd
things to photograph, perhaps it´s some kind of
art.
Asphalt is a sticky,
black and highly viscous liquid or semi-solid that is
present in most crude petroleums and in some natural deposits.
It is most commonly modeled as a colloid, with asphaltenes
as the dispersed phase and maltenes as the continuous
phase (though there is some disagreement amongst chemists
regarding its structure). In U.S. terminology, asphalt
(or asphalt cement) is the carefully refined residue from
the distillation process of selected crude oils. Outside
North America, the product is called bitumen.
Asphalt or bitumen can sometimes be confused with tar,
which is a similar black thermo-plastic material produced
by the destructive distillation of coal. During the early
and mid twentieth century when town gas was produced,
tar was a readily available product and extensively used
as the binder for road aggregates. The addition of tar
to Macadam roads lead to the word Tarmac which is now
used in common parlance to refer to road making materials.
However, since the 1970s, when natural gas succeeded town
gas, asphalt (bitumen) has completely overtaken the use
of tar in these applications.
Metals are often extracted from the Earth by means of
mining, resulting in ores that are relatively rich sources
of the requisite elements. Ore is located by prospecting
techniques, followed by the exploration and examination
of deposits. Mineral sources are generally divided into
surface mines, which are mined by excavation using heavy
equipment, and subsurface mines.
A photograph (often shortened to photo) is an image created
by light falling on a light-sensitive surface, usually
photographic film or an electronic imager such as a CCD
or a CMOS chip. Most photographs are created using a camera,
which uses a lens to focus the scene's visible wavelengths
of light into a reproduction of what the human eye would
see. The process of creating photographs is called photography... |
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