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  2. Rock (geology) - Wikipedia

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

    Anthropic rock is synthetic or restructured rock formed by human activity. Concrete is recognized as a human-made rock constituted of natural and processed rock and having been developed since Ancient Rome. [23] Rock can also be modified with other substances to develop new forms, such as epoxy granite. [24]

  3. Natural arch - Wikipedia

    en.wikipedia.org/wiki/Natural_arch

    A natural arch, natural bridge, or (less commonly) rock arch is a natural landform where an arch has formed with an opening underneath. Natural arches commonly form where inland cliffs , coastal cliffs , fins or stacks are subject to erosion from the sea, rivers or weathering ( subaerial processes).

  4. 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.

  5. List of rock formations - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_formations

    A rock formation is an isolated, scenic, or spectacular surface rock outcrop. Rock formations are usually the result of weathering and erosion sculpting the existing rock. The term rock formation can also refer to specific sedimentary strata or other rock unit in stratigraphic and petrologic studies.

  6. List of rock formations in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_formations_in...

    Indian Rock, Indian Rock Park; Joshua Tree National Park. Skull Rock; Lover's Leap; Mono Lake Tufa State Natural Reserve; Moro Rock, Sequoia National Park; Morro Rock; Mussel Rock; Nine Sisters (aka "The Morros"), San Luis Obispo; Pinnacles National Park; Potato Chip Rock; Rainbow Basin; Red Rock Canyon; Robbers Roost; San Pedro Rock; Santee ...

  7. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however.

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