7. Which of the following places participate most in internet communications (core- periphery relationships)?
a) the Caribbean
b) Southeast Asia
c) East Asia
d) Sub-Saharan Africa
e) Central America

Which of the following types of nonrenewable fuel sources requires the storage of radioactive waste? a. coal b. nuclear c. solar d. oil

This is a 2017 topographic map of puerto rico in the united states, and i'm sorry that people there have suffered such a disaster. i want to ask, what do the yellow dots and areas represent on this graph? and the blue area and the little blue circle, and the little blue sign that looks like a signal tower, what do they stand for?

What is the thickest layer of earth called?