Found 2 resources for the concept:
Human influence may be causing a modern mass extinction.
- UC Museum of Paleontology
Time: 30 minutes
Usually, extinction operates at a fairly constant rate, culling some species while speciation generates new ones. However, at a few points in life's history the humdrum of regular extinction has been interrupted by mass extinctions. Learn more about these biodiversity crises.
- Zimmer, Carl
Time: 1.5 hours
This excerpted chapter from Carl Zimmer's book, The Tangled Bank, describes the evolutionary processes responsible for large scale patterns in the diversity of life through time. Reprinted with the permission of Roberts and Company Publishers, Inc.
This resource is available from the National Center for Science Education.