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
Horizontal blanking interval time. This part of the line display process is the Horizontal Blank. In detail, the Horizontal blanking interval consists of: In the NTSC television standard, horizontal blanking occupies (17.2%) out of every scan line. In PAL, it occupies (18.8%) out of every scan line. In the PAL television standard, the blanking level corresponds to the black level, whilst other standards, most notably NTSC, set the black level slightly above the blanking level on a 'pedestal'. Some graphics systems can count horizontal blanks and change how the display is generated during this blank time in the signal; this is called a