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ERIC Number: EJ868870
Record Type: Journal
Publication Date: 2009-Dec
Pages: 5
Abstractor: As Provided
Reference Count: 4
ISSN: ISSN-0887-2376
How Old? Tested and Trouble-Free Ways to Convey Geologic Time
Clary, Renee
Science Scope, v33 n4 p62-66 Dec 2009
Geologic time, or the time frame of our planet's history, is several orders of magnitude greater than general human understanding of "time." When students hear that our planet has a 4.6-billion-year history, they do not necessarily comprehend the magnitude of deep time, the huge expanse of time that has passed from the origin of Earth through the present day. To help students comprehend this difficult concept, this article features two good methods that can be used to introduce the enormity of deep time in middle-level classrooms--The Clap the Earth's Life demonstration and the Bathroom Tissue Timeline. (Contains 5 figures.)
National Science Teachers Association. 1840 Wilson Boulevard, Arlington, VA 22201-3000. Tel: 800-722-6782; Fax: 703-243-3924; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Secondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A