Why does karst topography only exist in some geographic locations?

According ti the following map, what are the most common mineral resources found in the united states?

Which feature of a map shows the relationship between a distance on a map and that distance on earth? key scale grid system compass rose

Rectangle qrst is shown. angle qrt is congruent to angle str, and angle str is complementary to angle qtr. which statement is true about angles qrt and qtr? they are congruent. they are complementary. they are supplementary. they are right angle