What are some of the dangers that volcanoes pose to human populations?
a. destruction of property from lava flow
b. destruction from mud flows
c. lung problems from ash and toxic gases
d. all of the above

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)