The Dunham classification is a system used for the <u>classification of carbonates</u>, which is a type of sedimentary rocks and was originally developed by Robert J. Dunham. This system of classification focuses upon <u>the textural properties of the carbonate rocks to provide the class names.</u>
Some of the examples of the carbonate sedimentary rocks are limestone and rock dolomite.
I don't know if you have to choose only one answer, because answers 2, 3, and 5. It affected throughout the world, and it also reduced communist nations and changed boundaries.