rock excavation
81ARCHAEOLOGY — The term archaeology is derived from the Greek words archaios ( ancient ) and logos ( knowledge, discourse ) and was already used in ancient Greek literature in reference to the study of ancient times. In its modern sense it has come to mean the… …
82History of the Panama Canal — The history of the Panama Canal goes back almost to the earliest explorers of the Americas. The narrow land bridge between North and South America offers a unique opportunity to create a water passage between the Atlantic and Pacific oceans. This …
83New Austrian Tunnelling method — NATM redirects here. For other uses, see NATM (disambiguation). The New Austrian Tunnelling method (NATM) was developed between 1957 and 1965 in Austria. It was given its name in Salzburg in 1962 to distinguish it from old Austrian tunnelling… …
84Valley of the Kings — The Valley of the Kings (Arabic: وادي الملوك Wadi Biban el Muluk ; Gates of the King ) [Reeves and Wilkinson (1996), p.6] is a valley in Egypt where, for a period of nearly 500 years from the 16th to 11th century BC, tombs were constructed for… …
85Landslide classification — There have been known various classifications of landslides and other types of mass wasting.For example, the McGraw Hill Encyclopedia of Science and Technology distinguishes the following types of landslies: *fall (by undercutting) *fall (by… …
86Geotechnical engineering — [ Boston s Big Dig presented geotechnical challenges in an urban environment.] Geotechnical engineering is the branch of civil engineering concerned with the engineering behavior of earth materials. Geotechnical engineering includes investigating …
87archaeology — archaeologist, n. /ahr kee ol euh jee/, n. 1. the scientific study of historic or prehistoric peoples and their cultures by analysis of their artifacts, inscriptions, monuments, and other such remains, esp. those that have been excavated. 2. Rare …
88Second Avenue Subway — Planned route of the NYC Subway Second Avenue Line ( T , in teal). Overview Type Rapid transit System …
89Hoko River Archeological Site — Infobox nrhp | name =Hoko River Archeological Site nrhp type = caption = nearest city= Pysht, Washington locmapin = Washington area = architect= architecture= added = March 21, 1978 governing body = Private refnum=78002735cite… …
90Impact crater — The prominent impact crater Tycho on the Moon. In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body. In most common usage,… …
