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2. Concretion - Wikipedia

   en.wikipedia.org/wiki/Concretion

   Concretions in Torysh, Western Kazakhstan Concretions with lens shape from island in Vltava river, Prague, Czech Republic Marlstone aggregate concretion, Sault Ste. Marie, Michigan, United States A concretion is a hard, compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary ...

3. List of rock types - Wikipedia

   en.wikipedia.org/wiki/List_of_rock_types

   The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.

4. Oddly shaped ‘stone’ on sea floor off Sicily was actually ...

   www.aol.com/oddly-shaped-stone-sea-floor...

   Scientific divers off the coast of Sicily were scouring the rocky sea floor when a large, rounded object stood out from the other stones. A ridge crossed the top of the rock — and they realized ...

5. List of rock formations - Wikipedia

   en.wikipedia.org/wiki/List_of_rock_formations

   Rocks formations and the Dedo de Deus (God's Finger) peak in the background, Serra dos Órgãos National Park, Rio de Janeiro state, Brazil Raouché or Pigeons' Rock in Beirut, Lebanon Druid Arch, Canyonlands National Park, Utah, US View of Meteora, Greece Rock formations in Ongamira Valley, Sierras de Córdoba, Argentina Belogradchik Rocks, Balkan Mountains, Bulgaria "Jaws", an erosional fin ...

6. Hoodoo (geology) - Wikipedia

   en.wikipedia.org/wiki/Hoodoo_(geology)

   A hoodoo (also called a tent rock, fairy chimney, or earth pyramid) is a tall, thin spire of rock formed by erosion. Hoodoos typically consist of relatively soft rock topped by harder, less easily eroded stone that protects each column from the elements. They generally form within sedimentary rock and volcanic rock formations.

7. Kummakivi - Wikipedia

   en.wikipedia.org/wiki/Kummakivi

   Kummakivi in September 2015. Another angle with person for scale. Kummakivi (lit. ' odd stone ' or ' strange stone ') [1] is a large balancing rock in Ruokolahti, Finland.The 7-metre (23 ft) long boulder lies on a convex bedrock surface with a very small footprint but so firmly that it cannot be rocked with human force.