Terrestrial rocks are formed by three main mechanisms:
- Sedimentary rocks are formed through the gradual accumulation of sediments: for example, sand on a beach or mud on a river bed. As the sediments are buried they get compacted as more and more material is deposited on top. Eventually the sediments will become so dense that they would essentially form a rock. This process is known as lithification. \n
- Igneous rocks have crystallised from a melt or magma. The melt is made up of various components of pre-existing rocks which have been subjected to melting either at subduction zones or within the Earth's mantle. The melt is hot and so passes upward through cooler country rock. As it moves, it cools and various rock types will form through a process known as fractional crystallisation. Igneous rocks can be seen at mid-ocean ridges, areas of island arc volcanism or in intra-plate hotspots. \n
- Metamorphic rocks once existed as igneous or sedimentary rocks, but have been subjected to varying degrees of pressure and heat within the Earth's crust. The processes involved will change the composition and fabric of the rock and their original nature is often hard to distinguish. Metamorphic rocks are typically found in areas of mountain building.
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{"fact":"Baking chocolate is the most dangerous chocolate to your cat.","length":61}
{"type":"standard","title":"Grand Trunk Western 5629","displaytitle":"Grand Trunk Western 5629","namespace":{"id":0,"text":""},"wikibase_item":"Q98136889","titles":{"canonical":"Grand_Trunk_Western_5629","normalized":"Grand Trunk Western 5629","display":"Grand Trunk Western 5629"},"pageid":71812411,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/19670917_06_GTW%2C_Kingsbury%2C_Indiana.jpg/330px-19670917_06_GTW%2C_Kingsbury%2C_Indiana.jpg","width":320,"height":204},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/e/e1/19670917_06_GTW%2C_Kingsbury%2C_Indiana.jpg","width":1801,"height":1150},"lang":"en","dir":"ltr","revision":"1288565971","tid":"4b42f6d4-2827-11f0-a4c4-8ab03a0512c3","timestamp":"2025-05-03T14:02:48Z","description":"Scrapped GTW K-4-a class 4-6-2 locomotive","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Grand_Trunk_Western_5629","revisions":"https://en.wikipedia.org/wiki/Grand_Trunk_Western_5629?action=history","edit":"https://en.wikipedia.org/wiki/Grand_Trunk_Western_5629?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Grand_Trunk_Western_5629"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Grand_Trunk_Western_5629","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Grand_Trunk_Western_5629","edit":"https://en.m.wikipedia.org/wiki/Grand_Trunk_Western_5629?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Grand_Trunk_Western_5629"}},"extract":"Grand Trunk Western 5629 was a 4-6-2 K-4-a steam locomotive, which was a copy of the United States Railroad Administration's (USRA) Light Pacific design, built by American Locomotive Company (ALCO) in 1924, for the Grand Trunk Western Railroad. It was used to haul commuter passenger trains in Michigan until March 1960, when it was purchased by Chicago-based railfan Richard Jensen, who used No. 5629 to pull several excursion trains in the Chicago area throughout the 1960s.","extract_html":"
Grand Trunk Western 562