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| 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.
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... |
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