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Gastric mucosa intestinal metaplasia under microscopy

Aerial view of the Colca canyon in Arequipa. Peru

Electronic components on a printed circuit board - chips and capacitors

closeup of circuit board with resistors, condensers, microchips and electronic components. b/w.

the Enchantment Lakes Trail in Leavenworth Washington USA.

Macro Close up of printed wiring and components on PC circuit board

$Wet rough asphalt black bitumen road pavement surface abstract grunge texture close-up top view background banner.\nBitumen is a sticky, black, highly viscous liquid or semi-solid form of petroleum. In the U.S., it is commonly referred to as asphalt. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term asphaltum was also used.\nTarmacadam is a road surfacing material made by combining crushed stone, sand, and tar. It is a more durable and dust-free enhancement of simple compacted stone macadam surfaces. The terms \$