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2. A deep, man-made hole or shaft drilled into the ground, e.g. in mining, or for digging a well or tunnel. bornhardt A bald, steep-sided, dome-shaped hill, mountain, or rock outcropping at least 30 metres (98 ft) in height and several hundred meters in width. Compare inselberg, tor, and nubbin. borough
A grab dredge. Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value.
A gas main being laid in a trench. A trench is a type of excavation or depression in the ground that is generally deeper than it is wide (as opposed to a swale or a bar ditch), and narrow compared with its length (as opposed to a simple hole or pit).
The most famous example of subterranean fiction is Jules Verne's 1864 science-fiction novel Journey to the Center of the Earth, which has been adapted many times as a feature film and for television. The novel is not an example of Hollow Earth, as his characters actually descend only 87 miles beneath the surface, where they find an underground ...
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A deep foundation is a type of foundation that transfers building loads to the earth farther down from the surface than a shallow foundation does to a subsurface layer or a range of depths. A pile or piling is a vertical structural element of a deep foundation, driven or drilled deep into the ground at the building site.
Archaeological material tends to accumulate in events. A gardener swept a pile of soil into a corner, laid a gravel path or planted a bush in a hole. A builder built a wall and back-filled the trench. Years later, someone built a pigsty onto it and drained the pigsty into the nettle patch. Later still, the original wall blew over and so on.
The stated areas of study of the Kola Superdeep Borehole were the deep structure of the Baltic Shield, seismic discontinuities and the thermal regime in the Earth's crust, the physical and chemical composition of the deep crust and the transition from upper to lower crust, lithospheric geophysics, and to create and develop technologies for deep ...
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