The xiphoid process is the smallest and most inferior region of the sternum, or breastbone. At birth, it is a thin, roughly triangular region of cartilage that slowly ossifies into a bone and fuses with the body of the sternum.
City Blocks differ in size, but the typical square city block reaches 16 or 17 per mile, or 2.21 to 2.50 Acres. Engineers use a typical city block as 100,000 sq. ft. for calculation estimates, which is about 17 blocks per mile or 2 1/4 acres. (A football field is 300 feet by 160 feet, which is 1.1 Acres.)
Other sizes are generally half of a CMU, measured either vertically or horizontally. Modern concrete blocks are made of a combination of Portland cement, heavy- or light-weight aggregate, water and additives to improve curing. A standard concrete block is 7 5/8 in. wide by 7 5/8 in. tall by 15 5/8 in. long. With a 3/8-in. masonry joint, that equates to 8-by-8-by-16 inches when the block is installed in a structure. To reduce weight, concrete blocks usually have two or three hollow cores taking up about 50 percent of the block's volume.