
An
arch is a curved structure capable of
spanning a space while supporting significant weight (e.g. a doorway in a stone
wall). The arch was first developed in the
Indus Valley civilization circa
2500 BC [1] and subsequently in
Mesopotamia,
Egypt,
Assyria,
Etruria, and later refined in
Ancient Rome. The arch became an important technique in
cathedral building and is still used today in some modern structures such as
bridges.
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