Tectonic Plates    Ring of Fire

Aswan High Dam

Hoover Dam

Agricultural Terracing        #2

Polders         #2

Deforestation     slash and burn         clear cutting

Aral Sea    #2     #3     #4      #5   

desertification             #2

Amazon      #2             #3         #4

Acid Rain    trees

Mexico City      #2

Chernobyl     #2

Valdez    #2     #3      #4



Europe 1914
Europe after World War I
Europe after World War II  1945       COLD WAR
Europe after fall of communism