Timeline: The emergence of Isis. 1  1/40 2000 Abu Musab al-Zarqawi (pictured here) forms an al-Qaeda splinter group in Iraq, al-Qaâeda in Iraq. Its brutality from the beginning alienates Iraqis and many al-Qaeda leaders. 2  2/40 2006 Al-Zarqawi is killed in a U.S. strike.
Subduction zone earthquake. The area where the earthquake occurred is a subduction zone where the Pacific Plate is subducting beneath the North American Plate. The crust of southern Alaska was compressed and warped due to plate movement prior to the great earthquake after the plates locked together.Crustal plate movement.he area where the earthquake occurred is a subduction zone where the Pacific Plate is subducting beneath the North American Plate. The crust of southern Alaska was compressed and warped due to plate movement prior to the great earthquake after the plates locked together. Crustal plate movement.
Geologists think that movement ofconvection currents in the mantle is the major force taht causes plate motion. Suring subduction, gravity pulls one edge of a plate down into the mantle. The rest of theplate also moves This slow movement is similar to what happens in a pot of soup when gravity causes the cooler, denser soup near the surface to sink.