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 household nobility formed a part of the Papal Court. On March 28, 1968, Pope Paul VI reorganized the Papal Court with an apostolic letter "motu proprio", renaming it the "Papal Household" (). In changing the name from what it had been for some centuries, Paul VI said he was returning an "original and noble" name. Moreover, many positions were consolidated into new ones or altogether abolished. According to the "motu proprio": "Many of the offices entrusted to members of the Papal Household were deprived of their function, continuing to exist as purely honorary positions, without much correspondence to concrete needs of