1 For automobiles a taxpayer uses for business purposes, the portion of the business standard mileage rate treated as depreciation is 23 cents per mile for 2013, the same as in 2012. 2  The IRS also publishes a standard mileage rate for the use of a vehicle for medical or moving purposes.
What causes continuous rolling thunder when no lightning visible? Thunder is caused by the rapid expansion of super-heated air as electrical spark passes through. What causes the long (ie some several seconds) of rumbling when no lightning is visible even at night during tropical downpours?
Mani Gandham, adtech/enterprise/software/startups. Views. Thunder is the sound caused by lightning. When a lightning bolt strikes, the air immediately around it is superheated by the pressure and temperature of the electricity. This heated air rapidly expands and creates a sonic shock wave similar to a bomb explosion or when a jet breaks the sound barrier.