This is known as a long vowel sound, because it says the ânameâ of the letter. The same goes for the other vowels. A short vowel sound is a vowel sound that does not follow this rule. When reading a word that uses a short vowel sound, will say the sound that the letter can make that is not its actual name. So in the case of âA,â the word âmainâ might have a long âAâ sound because we pronounce the âAâ as /Ä/, whereas the word âmanâ has a short vowel sound.
Gill arches supporting the gills in a pike. Branchial arches, or gill arches, are a series of bony loops present in fish, which support the gills. As gills are the primitive condition of vertebrates, all vertebrate embryos develop pharyngeal arches, though the eventual fate of these arches varies between taxa.
The central feature of an arch is the keystone, or the wedge-shaped stone at the very top of the arch. It is the last stone placed during construction, and it locks all the other stones of the arch into position. The keystone bears almost no weight, but is the center of redirecting the weight of the structure down and outwards. The Romans used arches with circular tops, called rounded arches, which were made of stone.