Cause and Effect
Understanding cause and effect relationships is an essential critical thinking skill for the GED and for life.
Cause and Effect Quiz: http://www.quia.com/mc/94601.html
Cause and Effect Transitions in Language:
http://lrs.ed.uiuc.edu/students/fwalters/causeconnect.html
Correlation and Causation (How Do You Know One Thing Causes Another?):
http://www.stat.tamu.edu/stat30x/notes/node42.html