A company car allowance is a predetermined sum paid to an employee as compensation for driving her own vehicle for business reasons. Companies use car allowances to minimize accounting costs. Once an employee has been allocated a car allowance, that amount is simply added to the employee's paycheck. For example, if the car allowance is $500 per month, this sum is paid to the employee via her paycheck.
Sedimentary rocks constitute about 10 percent of the earthâs crust by volume but cover 75 percent of the earthâs surface. Most of the rocks are concentrated on continents (500 million cu km) and continental slopes (190 million cu km); the ocean floor accounts for 250 million cu km. On continents about 75 percent by volume of all sedimentary rock is confined to geosynclinal regions, and about 25 percent is associated with platforms. More than 75 percent of the useful minerals extracted from the earthâs interior are contained in sedimentary rock.
Shale is the most abundant of the sedimentary rocks, accounting for roughly 70 percent of this rock type in the crust of the Earth. 1  Shales are often found with layers of sandstone or limestone. 2  Shales characteristically consist of at least 30 percent clay minerals and substantial amounts of quartz.