The space between two index contour lines is 500 feet. There are four light colored contour lines in between. What is the contour interval? 250 feet
500 feet
100 feet

Which of the following planets is classified as a terrestrial planet? a. neptune b. venus c. saturn d. jupiter

Which continents lie only in the northern hemisphere

People keep spending additional units of a particular resource on a want until their marginal benefit is  decreasing withgreater thanless thannot affected by  their marginal cost.