Chemical sedimentary rocks are a different type of sedimentary rock because they are not made up of weathered sediment grains; instead they are composed of mineral crystals that form out of solution. In other words, chemical sedimentary rocks contain crystals and other elements that have been dissolved out of water.
Had you heard that people from parts of New Orleans sound like New Yorkers, or that residents of North Carolina's outer banks can sound more like folks from Charleston, South Carolina than other southerners? All this information and more is available on Rick Aschmann's map of English dialects in North America. Regional American accents can be tough to decipher, especially for foreigners. In addition to being endlessly fascinating, Mr Aschmann's map can actually be a useful tool.
This is because the founders of these places usually had both Chinese and vietnamese ancestry. This is similar to how the Italian accent influenced the Argentine spanish accent. The northern and central Vietnamese accents sound very different to Southern Vietnamese and do not sound like Cantonese.