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Nebraska hydrogeology is known through extensive irrigation well drilling for agriculture. In the early 1990s, a USGS study focused on Shelton, Nebraska and the Platte River found Holocene and Pleistocene sand and gravel deposits interbedded with clay and silt between 45 and 100 feet thick, overlying other Quaternary silt deposits between 10 ...
Nebraska (/ n ə ˈ b r æ s k ə / ⓘ nə-BRASS-kə) [17] is a landlocked state in the Midwestern region of the United States. It borders South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwest; and Wyoming to the west.
Currently, there are 44 landlocked countries, two of them doubly landlocked (Liechtenstein and Uzbekistan), and three landlocked de facto states in the world. Kazakhstan is the world's largest landlocked country, Kyrgyzstan is the furthest landlocked country from any ocean, while Ethiopia is the world's most populous landlocked country. [1] [2]
The African plate, also known as the Nubian plate, is a major tectonic plate that includes much of the continent of Africa (except for its easternmost part) and the adjacent oceanic crust to the west and south. It also includes a narrow strip of Western Asia along the Mediterranean Sea, including much of Israel and Lebanon.
Map of North America during the mid-Cretaceous Period, illustrating the Western Interior Seaway. No Precambrian fossils are known from Nebraska, and the state's fossil record begins in the Paleozoic. From the Cambrian through the Devonian, Nebraska was covered by a shallow sea. None of the rocks deposited in this environment are exposed at the ...
Satellite view of Africa 1916 physical map of Africa. The average elevation of the continent approximates closely to 600 m (2,000 ft) above sea level, roughly near to the mean elevation of both North and South America, but considerably less than that of Asia, 950 m (3,120 ft). In contrast with other continents, it is marked by the comparatively ...
The Mediterranean Sea, between Africa and Europe The Atlantic Ocean around the plate boundaries (text is in Finnish). The African and European mainlands are non-contiguous, and the delineation between these continents is thus merely a question of which islands are to be associated with which continent.
In classical antiquity, Africa (also Libya) was assumed to cover the quarter of the globe south of the Mediterranean, an arrangement that was adhered to in medieval T and O maps. The only part of Africa well known in antiquity was the coast of North Africa, described in Greek periplus from the 6th century BC.