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?
Normally, however, the result is rain, wind, lightning, and thunder. Without lightning, there would be no thunder in thunderstorm.. Thunder is the noise lightning makes as it travels through the air. Lightning occurs during all thunderstorms (though not every time it rains). During a storm, it strikes Earth 100 times each second. More than just a dazzling light show, lightning causes billions of dollars in damage each year. Lightning forms when updrafts of air carry water droplets, which have a charge, upward to heights where some freeze into ice and snow particles. They form a cloud.