Level 7 Unit 12
Writing Form: Cause and Effect


The Fragile Frog
by William P. Mara
An explanation of why the Pine Barrens tree frog has become an endangered species.
  Geysers: When Earth Roars
by Roy A. Gallant
Discusses the causes of geysers and their useful effects.


Breaking into Print: Before and After the Printing Press
by Stephen Krensky
A history of the printing press.
by Michael Allaby
A presentation of the causes and effects of hurricanes.


Causes and Consequences of World War I
by Stewart Ross
Coverage of World War I and the global changes it wrought.
  Supercomputers: Shaping the Future
by Charlene W. Billings
Explores the future of the supercomputer.



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