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 mint lost since 1870, been restored in the form of the Vatican City State, but also much new research has been done on the subject of Papal coins, and with it many new discoveries. Moreover, the whole legal and operational basis for the issue of papal coinage has been twice substantially modified, once by the Lateran Pacts and once with the introduction of the euro. While the Catholic Encyclopedia article states, "There can be no papal coins of earlier date than that of the temporal power of the popes", in fact coinage may well have predated the emancipation of the Papal