Scholastic
Scholastic: So That's the Reason! [Pdf]
Simple, one-page printable worksheet to introduce your students to cause and effect. Gives one set example, and has space at the bottom to apply to any story you read.
TED Talks
Ted: Ted Ed: Feedback Loops: How Nature Gets Its Rhythms
Anje-Margriet Neutel describes some common positive and negative feedback loops, examining how an ecosystem's many loops come together to make its 'trademark sound.' [5:11]
Teachers.net
Teachers.net: Cause and Effect
Simple and effective method for introducing primary students to the concept of cause and effect in literature.
Scholastic
Scholastic: A Not So Glorious Victory
After reading "A Not-So-Glorious," Victory, which is included on this page, have your students practice identifying cause and effect using the printable worksheet.
Other
Gallaudet University: English Works: Guide to Different Types of Essays
English Works site has suggestions on how to write an essay to convey helpful information. This site offers examples of eight different types of essays and graphic organizers.