How might a plateau show the effects of both tectonic process and erosion?

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.

What could the united states of america do to improve their status? name at least 3(ap human geography)

What would have happened to portugal’s trade if they had not found a way to sail around the tip of africa