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Bentonite usually forms from weathering of volcanic ash, most often in the presence of water. However, the term bentonite, as well as a similar clay called tonstein, have been used for clay beds of uncertain origin. For industrial purposes, two main classes of bentonite exist: sodium bentonite and calcium bentonite.
List of countries by bentonite production; A. Ayilo; D. Deicke and Millbrig bentonite layers; S. Smectite This page was last edited on 1 April 2018, at 17:33 (UTC ...
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The following is an alphabetical list of subregions in the United Nations geoscheme for Europe, created by the United Nations Statistics Division (UNSD). [1] The scheme subdivides the continent into Eastern Europe, Northern Europe, Southern Europe, and Western Europe. The UNSD notes that "the assignment of countries or areas to specific ...
The list below includes all entities falling even partially under any of the various common definitions of Europe, geographical or political.Fifty generally recognised sovereign states, Kosovo with limited, but substantial, international recognition, and four largely unrecognised de facto states with limited to no recognition have territory in Europe and/or membership in international European ...
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.
This is a list of countries and territories by the United Nations geoscheme, including 193 UN member states, two UN observer states (the Holy See [note 1] and the State of Palestine), two states in free association with New Zealand (the Cook Islands and Niue), and 49 non-sovereign dependencies or territories, as well as Western Sahara (a disputed territory whose sovereignty is contested) and ...
This is a list of countries by feldspar production in 2019 based on British Geological Survey data. [1] Feldspar production (tonnes) by country Rank Country