What are the two main things that cause external changes on earth? a. weathering and erosion b. physical and chemical c. sheet and continental glaciers d. hot and cold temperatures

Who ever answer first get ! question 1: which term names the outer edge all around a watershed? a. divide b. basin c. boundary d. collection area question 2: which feature does contour line indicate on a topographic map? a. the path of a river through the watershed b.equal elevation c. similar runoff level d. the boundary of an aquifer