When two plates of continental lithosphere collide

a. the plates become sutured together and mountains form

b. a rift valley forms

c. has a granitic composition

d. is thicker than continental lithosphere

Which two essential elements of geography are missing from the image above? a. “location” and “region” b. “movement” and “places” c. “humans and the environment” and “movement” d. “places and regions” and “human systems”

Explore the ways that boundaries influence identity, interaction and exchange. things to consider: what is the race/ethnicity. how easy is it to interact/trade with others.

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.