The Internal Revenue Service (IRS) establishes a tax ceiling on reimbursement for business travel by car. The IRS ordinarily updates the mileage rates once in each calendar year; however, on occasion a special adjustment has been made within the year due to changed costs.
Figure 10h-2: Structure of the Earth's crust and top most layer of the upper mantle. The lithosphere consists of the oceanic crust, continental crust, and uppermost mantle. Beneath the lithosphere is the asthenosphere. This layer, which is also part of the upper mantle, extends to a depth of about 200 kilometers.
The lithosphere is a layer that includes the crust and the upper most portion of the mantle (Figure 10h-2). This layer is about 100 kilometers thick and has the ability to glide over the rest of the upper mantle.he core is a layer rich in iron and nickel that is composed of two layers: the inner and outer cores. The inner core is theorized to be solid with a density of about 13 grams per cubic centimeter and a radius of about 1220 kilometers.