Which phrase identifies the standard difference in elevation on a topography map? index contour contour interval scale bar topographic symbol

contour interval

Explanation:

The correct answer is - contour interval.

The contour interval is the standard difference in elevation on the topographic maps. The contour lines themselves represent closed circular lines that connected dots that have the same elevation. The standard contour lines are set at an exact same interval, be it 5, 20, 100 meters. That elevation distance is actually representing the contour interval itself, which is the vertical distance between two contour lines.

bc blah

explanation:

bc blah

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.