17. Why do issues of pollution and radiation (Chernobyl) usually involve more than one country? * a. the euro can be used to pay for the clean up
b. pollution spreads across national boundaries
c. cleanup is the responsibility of the United Nations
d. individuals refuse to obey national laws

b. niger

explanation:

sediment layers stop spreading when they reach a barrier or they run out of sedimentary material. lateral spreading is the movement of gently to steeply sloping, saturated soil deposits caused by earthquake-induced liquefaction. i hope this . : )

just took the test the answer is b.