Girl Scout Cadettes wear the official Girl Scout Membership Pin on their uniform. The Girl Scout Membership Star is worn with white membership disks. Girl Scout Cadettes use the Girl's Guide to Girl Scouting for Cadettes and the National Leadership Journeys to earn diamond shaped badges.
Definitions and images to illustrate geological terms, links to images and website articles. A syncline is a concave geological fold, with layers that dip downward toward the center of the structure. This arrangement is opposite to that of an arching anticline.
The definition of parallel lines as a pair of straight lines in a plane which do not meet appears as Definition 23 in Book I of Euclid's Elements. Alternative definitions were discussed by other Greeks, often as part of an attempt to prove the parallel postulate.