tuesday washington time. and 14 disaster experts with usaid and six rescue dogs incorporated into both of these teams. >> rescue workers are struggling to reach remoltte villages. they do not know how many americans are still missing. there are reports there are dozens. we're kb getting this video of a man pulled from the rubble 48 hours later. he was found by a turkish rescue team. it's one of the scenes of humanity we have scene. we want to look how this happened and why nepal is prone to earthquakes. let's look at the fault lines around the world. most of the earth's seismic activity takes place around the fault lines. a fault is fracture between two plates. there are three kinds. there's a normal when one mass -- these are the two