Cross section (geometry) of Earth at right. Cross-sections are often used in anatomy to illustrate the inner structure of an organ, as shown at left. A cross-section of a tree trunk, as shown at left, reveals growth rings that can be used to find the age of the tree and the temporal properties of its environment. Cross section (geometry) In geometry and science, a cross section is the non-empty intersection of a solid body in three-dimensional space with a plane, or the analog in higher-dimensional spaces. Cutting an object into slices creates many parallel cross sections. The boundary of a cross section in
Papal Slippers Papal Slippers The papal slippers are a historical accoutrement worn by the Pope. The papal slippers were a form of episcopal sandals worn by bishops. However, unlike the (rarely seen) episcopal sandals, which change with the liturgical colour, the papal slippers were always red. Usually elaborate, papal slippers were made by hand with red satin, red silk, and gold thread; they featured an embroidered cross garnished with rubies and the soles were made of leather. Until the first half of the 20th century, it was customary for pilgrims having an audience with the Pope to kneel and kiss one of