What caused a a major disaster in chernobyl, ukraine, in 1986?

Which of the following best describe the difference between a nation-state and a city-state

Which items are described by the geographic theme of movement? ahmad's great-grandparents were originally from afghanistan. songs and movies made in india are very popular in afghanistan. afghanistan is east of iran. afghanistan's rugged mountains provide protection for its people. much of afghanistan's forests are being cut down for fuel. afghanistan exports wool to turkey and india.

Which term describes all the actions a nation takes in dealing with other countries of the world