What is a Keystone?

What is a keystone? You might think that all arches are made the same way. The fact is they are not all the same. Typical Roman arch with keystone. It is true that Egyptian, Babylonian, Greek and Assyrian civilizations used arches for underground structures such as drains and vaults. However, it was the Roman civilization (1000 B.C.E. - 500 C.E.) that first began using a keystone (also called a capstone) in their arches. The keystone is the topmost stone in the arch. The one in the illustration on the right is exaggerated in size from what a normal keystone would be.

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This lesson covers keystone species and trophic cascades. It teaches the students what these terms mean and why it is important that ecosystems remain

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KEYSTONE SPECIES A keystone species is a plant or animal that plays a unique and crucial role in the way an ecosystem functions. Without keystone species, - ppt video online download

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