| Show How National Parks and National Monuments Differ There are 20 O national parks and more than 70 national monuments Generally speaking national parks are arc areas arens preserved by the federal government because of or their outstanding outstanding out out- standing scenery ry while national monuments are nrc either cither bull buildings or areas prese preserved ed because of ot their prehistoric historic scientific geologic geologic geologic geo geo- logic or biologic Interest For example Carlsbad caverns In New Mexico Is classified as a national national na na- na- na tlona p park rk while Chaco canyon In New Mexico Is listed as a national monument of Interest because of prehistoric prehIstorIc prehistoric pre pre- historic cliff dwellings Th Though most of or the national parks are In the tho West and Southwest there are arc others others others oth oth- ers In all aU parts of the United States In A Alaska isla nn and Hawaii Both national national na na- parks and nud national monuments are open to the public During the thelast lost last 25 years rears visitors registering at national parks s have Increased from about annually to more than In 1035 1935 There are In addition addition addition ad ad- eight national l military parks and 13 1 national forests with n a total area of acres Washington Star |