Churches require a very large open space that is is either free of columns, or limits columns to the periphery so that the worshipers view to the altar is unobstructed. In modern times, spanning large distances is made relatively easy by the use of steel. However, in those early eras of church construction, the process for making steel had not yet been invented by humans. This meant that the structural materials used in buildings were limited to masonry, wood, and concrete-like mixes. When used as a beam, the physical properties of wood limit the length that it can span to relatively short distances. Thus, the traditional building method known as "post and lintel" (beam and column) was not much of an option if very large column-free spaces were desired.
When humans discovered how to make arches out of stone and bricks, it provided a way to span much greater distances without columns. Thus, the large, column-free churches of the past were made out of series of arches.
Over time, the look and feel of these arched cathedrals became the symbol and standard of a Christian church, and so even in current times when steel beams are available, churches are often made to resemble the arched-construction of the past.
In reality, the arches found in modern day churches are not actually "true arches" that transmit forces by compression only, from the keystone down - but rather steel framed structures that are shaped to mimic the appearance of the arches of the iconic churches of the past.
Arches were primarily used in stone buildings to give a large amount of support without requiring columns every few metres/yards. Rooms and gates could be larger while using less material to hold the same load. Modern arches are typically more of an aesthetic ('it looks nice') design choice than a functional one, although some are made so they are both.
to keep water from staying on the roof and create mold
Primarily we build for shelter.
to build a better building
vault
vault
A Vault
A process in which molten metal is poured into a mold and allowed to harden.
The architectural term is "vault"; some call it a cathedral ceiling.
vault
vault
A Vault
because those were the trends back then
Freedom. Usually Hindu temples' architecture is done according to Hindu scripture.
Conestoga wagons had a roof made with canvas. The canvas was supported with a wooden frame and suspension and both were made with wood. The covers were arched and were usually white.
A process in which molten metal is poured into a mold and allowed to harden.
The purpose of having roof vents are the following; preserving the life of the roof, reducing the moisture inside the roof, maintaining the right ventilation inside the roof to avoid molds and moisture and for aesthetic and style purposes as well.
Arched!
The Parthenon is not arched. Look again.
1 syllable in arched.
A Hogan is a structure used by a North American Indian tribe. I'm not sure which. I believe it is a long arched roof building, log construction I think.