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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 ...
Eastern white pine, a cultural keystone species for the Kitcisakik Algonquin community. The white pine (Pinus strobus L.), found across northeastern North America, is a cultural keystone species for the Kitcisakik Algonquin community in Quebec. The tree is prevalent in legends and myths that are central to the culture, history, and identity of ...
Design of the keystone symbol on the Pennsylvanian government's website [1]. 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 or key-stone may refer to: Keystone (architecture), a central stone or other piece at the apex of an arch or vault; Keystone (cask), a fitting used in ale casks;
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Without keystone species, the ecosystem would be dramatically different or cease to exist altogether. Some keystone species, such as the wolf and lion, are also apex predators. The role that a keystone species plays in its ecosystem is analogous to the role of a keystone in an arch. While the keystone is under the least pressure of any of the ...
Shoulder sleeve insignia of the 28th "Keystone" Infantry Division. Worn by soldiers of 2nd Brigade, 28th Infantry Division. Distinctive brigade badge. The 2nd Infantry Brigade Combat Team is a unit of the Pennsylvania Army National Guard’s 28th Infantry Division.
Northwell Health focuses on how women need access to supplemental screening tests to find the cancers that mammograms might miss.