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The activity of soil is the ratio of the plasticity index to the clay size fraction. If activity is less than 0.75, the soil is inactive. If activity exceeds 1.4, then the soil is termed active. If activity lies within the above values, then the soil will be moderately active. [10]
Albert Atterberg. Albert Mauritz Atterberg (19 March 1846 – 4 April 1916) was a Swedish chemist and agricultural scientist who created the Atterberg limits, which are commonly referred to by geotechnical engineers and engineering geologists today. In Sweden he is equally known for creating the Atterberg grainsize scale, which remains the one ...
The first classification, the International system, was first proposed by Albert Atterberg in 1905 and was based on his studies in southern Sweden. Atterberg chose 20 μm for the upper limit of silt fraction because particles smaller than that size were not visible to the naked eye, the suspension could be coagulated by salts, capillary rise within 24 hours was most rapid in this fraction, and ...
Percentage figures for arable land, permanent crops land and other lands are all taken from the CIA World Factbook [1] as well as total land area figures [2] (Note: the total area of a country is defined as the sum of total land area and total water area together.) All other figures, including total cultivated land area, are calculated on the ...
57,485 km 2 (22,195 sq mi) General map of Germany. Germany (German: Deutschland) is a country in Central and Western Europe [3] that stretches from the Alps, across the North European Plain to the North Sea and the Baltic Sea. It is the second-most populous country in Europe after Russia, and is seventh-largest country by area in the continent.
For a list of European cities by country, see List of cities in Europe. Moscow, the capital of Russia, has the most populous metropolitan area in Europe. Europe and some parts of Africa and Asia by night. Lights reveal the urbanized areas of Europe. It also shows the Blue Banana megalopolis from north-west England to northern Italy, and the ...
Satellite image of Europe by night 1916 physical map of Europe Topography of Europe. Some geographical texts refer to a Eurasian continent given that Europe is not surrounded by sea and its southeastern border has always been variously defined for centuries. In terms of shape, Europe is a collection of connected peninsulas and nearby islands.
Soil map from "Geography of Ohio," 1923. Soil map is a geographical representation showing diversity of soil types and/or soil properties (soil pH, textures, organic matter, depths of horizons etc.) in the area of interest. [1] It is typically the result of a soil survey inventory, i.e. soil survey. Soil maps are most commonly used for land ...