Cave System: A collection of caves all connected by passageways of corridors. Most well-known cave systems have been mapped out so that spelunkers can find their way in and out of system and also so that rescuers can find anyone who may be lost in the system.
Spelunker: A person who explores caves.
Graphs: Abstract structures used to model relationships between two or more objects. These graphs are not the same as the graphs of functions that are commonly studied in secondary school; instead, these graphs have vertices that are connected by edges and these edges represent relationships between the vertices.
Vertices (vertex): The point of intersection of two or more paths or edges.
Edges: Lines created by joining vertices.
Stationary: Not moving; standing still.
Order: In reference to the number of vertices a graph contains. For instance, the first graph below would be of order 3 whereas the second graph would be of order 5. It is also important to note that these are two different types of graphs:
