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  2. Birthstone - Wikipedia

    en.wikipedia.org/wiki/Birthstone

    Garnet, the birthstone for January. Amethyst, the birthstone for February. Aquamarine, the birthstone for March. Diamond, the birthstone for April. Emerald, the birthstone for May. Pearl, one of three June birthstones. Moonstone, one of three June birthstones. Alexandrite, one of three June birthstones.

  3. 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 ...

  4. 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.

  5. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Claystone – Clastic sedimentary rock composed primarily of clay-sized particles. Coal – Combustible sedimentary rock composed primarily of carbon. Conglomerate – Sedimentary rock composed of smaller rock fragments. Coquina – Sedimentary rock that is composed mostly of fragments of shells.

  6. Georgia Guidestones - Wikipedia

    en.wikipedia.org/wiki/Georgia_Guidestones

    March 22, 1980. ( 1980-03-22) Dismantled date. July 6, 2022. The Georgia Guidestones was a granite monument that stood in Elbert County, Georgia, United States, from 1980 to 2022. It was 19 feet 3 inches (5.87 m) tall and made from six granite slabs weighing a total of 237,746 pounds (107,840 kg). [ 1] The structure was sometimes referred to as ...

  7. Plecoptera - Wikipedia

    en.wikipedia.org/wiki/Plecoptera

    Plecoptera is an order of insects, commonly known as stoneflies. Some 3,500 species are described worldwide, [ 1] with new species still being discovered. Stoneflies are found worldwide, except Antarctica. [ 2] Stoneflies are believed to be one of the most primitive groups of Neoptera, with close relatives identified from the Carboniferous and ...

  8. Medicine wheel - Wikipedia

    en.wikipedia.org/wiki/Medicine_wheel

    The wheels can be large, reaching diameters of 75 feet. The most common variation between different wheels are the spokes. There is no set number of spokes for a medicine wheel to have although there are usually 28, the same number of days in a lunar cycle. The spokes within each wheel are rarely evenly spaced, or even all the same length.

  9. Diorite - Wikipedia

    en.wikipedia.org/wiki/Diorite

    Diorite. Diorite ( / ˈdaɪ.əraɪt / DY-ə-ryte) [ 1][ 2] is an intrusive igneous rock formed by the slow cooling underground of magma (molten rock) that has a moderate content of silica and a relatively low content of alkali metals. It is intermediate in composition between low-silica ( mafic) gabbro and high-silica ( felsic) granite .

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