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The keystone (shown in red) of an arch Dropped keystone at Colditz Castle. A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to ...
Keystone species, species that have a larger effect on their environment than is purely due to their abundance; Operation Keystone, during World War II; Keystone, a variety of screwdriver blade "Keystone", a descriptive reference to the Book of Mormon; The Keystone, journal of the Pennsylvania Railroad Technical and Historical Society
The keystone symbol is the name commonly given to the de-facto state emblem of Pennsylvania. [2] It is a stylized keystone (or capstone ), an architectural term for a wedge-shaped stone placed at the top of an arch . [ 3 ]
Keystone mutualists are organisms that participate in mutually beneficial interaction, the loss of which would have a profound impact upon the ecosystem as a whole. For example, in the Avon Wheatbelt region of Western Australia , there is a period of each year when Banksia prionotes (acorn banksia) is the sole source of nectar for honeyeaters ...
The keystone effect is the apparent distortion of an image caused by projecting it onto an angled surface. It is the distortion of the image dimensions, such as making a square look like a trapezoid , the shape of an architectural keystone , hence the name of the feature.
The operator of the Keystone pipeline system has finished cleaning up a massive December 2022 oil spill, and the creek affected by it is flowing naturally again, the company and the U.S ...
Keystone beer is a product of the Molson Coors Beverage Company in Golden, Colorado. It was first introduced in Chico, California in September 1989. Keystone Ice can be found in canned, kegged , and occasionally, bottled form, with 5.9% ABV.
Keystone is a supplier of meat protein to fast food restaurants and retail stores across the world, including serving as a major supplier of chicken nuggets to McDonald’s. Other products include ...