Where in the world can volcanic mountains be found

What factors did the founders of your state use to determine the states boundaries ? did you states founders choose boundaries based on physical features or lines longitude and latitude ?

Witch layer of the atmosphere has the most air pressure

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it