Sometimes a diffusion process encounters barriers that slow or stop the spread of an innovation. Which of the following is an example of such a barrier? a. A lack of infrastructure to support a new technology
b. A change in the price of energy
c. A jump from contagious to hierarchical diffusion
d. A transition from stimulus to contagious diffusion
e. A new form of media to broadcast information

Which of the following statements about geographers' perceptions and perspectives is false? a. geographers avoid looking at the world with different perspectives. b. regions are a relative thing and a matter of perception. c. spatial distribution can be a matter of perception. d. mental maps are a way that people memorize and perceive the world around them. select the best answer from the choices provided. a b c d