Eruptions of the Yellowstone volcanic system have included the two largest volcanic eruptions in North America in the past few million years; the third largest was at Long Valley in California and produced the Bishop ash bed.
On the diesel Passat, the TDI badge stands for Turbocharged Direct Injection, which isn't really all that helpful as the gasoline-powered Passat is also turbocharged and also uses direct injection. Volkswagen attempts to clear this up by calling this Passat the Passat TDI Clean Diesel.
What is TDIU? TDIU (also known as IU) stands for Total Disability Based on Individual Unemployability. TDIU is a Department of Veteransâ Affairs (VA) disability benefit available to veterans whose service-connected disability or disabilities render them unable to work.