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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
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 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 ]
The keystone is the centre stone or masonry unit at the apex of an arch. The springer is the lowest voussoir on each side, located where the curve of the arch springs from the vertical support or abutment of the wall or pier. [1] The keystone is often decorated or enlarged.
Since the 1960s, a remnant population of sea otters has revived Monterey Bay. But they can't migrate north throughout their historic range without human help.
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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.