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Sinkholes are just one of many forms of ground collapse, or subsidence. Land subsidence is a gradual settling or sudden sinking of the Earth’s surface owing to subsurface movement of earth materials. The principal causes of land subsidence are aquifer-system compaction, drainage of organic soils, underground mining, hydrocompaction, natural compaction, sinkholes, and thawing permafrost. Land subsidence can affect areas that are thousands of square miles in size.
Explanation:
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<span>Abraham Ortelius was born Abraham Ortels of German parents in Antwerp on April 14, 1527. He was trained as an engraver, worked as an illuminator of maps, and by 1554 was in the business of selling maps and antiquities. This business involved extensive traveling, which enabled Ortelius to make contacts with the international community of scholars concerned with exploration and cartography and especially with English experts like Richard Hakluyt and John Dee.</span>
