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  2. Formation of rocks - Wikipedia

    en.wikipedia.org/wiki/Formation_of_rocks

    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.

  3. Geology of the Rocky Mountains - Wikipedia

    en.wikipedia.org/wiki/Geology_of_the_Rocky_Mountains

    The rocky cores of the mountain ranges are, in most places, formed of pieces of continental crust that are over one billion years old. In the south, an older mountain range was formed 300 million years ago, then eroded away. The rocks of that older range were reformed into the Rocky Mountains. The Rocky Mountains took shape during an intense ...

  4. Mountain formation - Wikipedia

    en.wikipedia.org/wiki/Mountain_formation

    Mountain formation refers to the geological processes that underlie the formation of mountains. These processes are associated with large-scale movements of the Earth's crust (tectonic plates). [1] Folding, faulting, volcanic activity, igneous intrusion and metamorphism can all be parts of the orogenic process of mountain building. [2]

  5. Rock (geology) - Wikipedia

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

    In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition, and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of ...

  6. Sedimentary rock - Wikipedia

    en.wikipedia.org/wiki/Sedimentary_rock

    Uluru (Ayers Rock) is a large sandstone formation in Northern Territory, Australia.. Sedimentary rocks can be subdivided into four groups based on the processes responsible for their formation: clastic sedimentary rocks, biochemical (biogenic) sedimentary rocks, chemical sedimentary rocks, and a fourth category for "other" sedimentary rocks formed by impacts, volcanism, and other minor processes.

  7. Geological formation - Wikipedia

    en.wikipedia.org/wiki/Geological_formation

    It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. [1][2] A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form.

  8. Geode - Wikipedia

    en.wikipedia.org/wiki/Geode

    Geode. A geode (/ ˈdʒiː.oʊd /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded. The crystals are formed by the filling of vesicles in ...

  9. Medicine Rocks State Park - Wikipedia

    en.wikipedia.org/wiki/Medicine_Rocks_State_Park

    Medicine Rocks State Park. Medicine Rocks State Park is a park owned by the state of Montana in the United States. It is located about 25 miles (40 km) west-southwest of Baker, Montana, and 11 miles (18 km) north of Ekalaka, Montana. The park is named for the "Medicine Rocks," a series of sandstone pillars similar to hoodoos some 60 to 80 feet ...

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