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This document describes how geologic time is approached in discussions of geologic topics. The uses of relative time and absolute time are compared, and a geologic time scale is provided to represent both concepts. References are provided. Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Illustration - scientific, Ref. material
Subject: Geologic time
 
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NASA ED Mall Collection    Browse collection
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This online calculator helps students understand the classic analogy of relating the geologic time scale to a yard stick. It will help reinforce the concept of the briefness of human history relative to the age of the Earth. Full description.
Grade level: High (9-12)
Resource type: Computer activity
Subject: Geologic time
 
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This online pamphlet discusses the concept of geologic time. Topics include the relative and radiometric time scales, the use of index fossils in making age determinations, and current thinking on the age of the Earth. Full description.
Grade level: High (9-12), College (13-14)
Resource type: Ref. material
Subject: Geologic time, Physics
 
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This document provides an explanation of the factors that are thought to drive the growth and retreat of continental glaciers which spread across the Earth during four periods of geologic history. These factors are thought ot be related to variations in Earth's orbit. Full description.
Grade level: High (9-12), College (13-14)
Resource type: Ref. material
Subject: Cryology, Geologic time
 
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This document discusses possible factors that contributed to the formation of massive continental glaciers during four periods of geologic history. Full description.
Grade level: High (9-12), College (13-14)
Resource type: Ref. material
Subject: Cryology, Geologic time, Hydrology, Physical oceanography
 
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This document briefly discusses the two models most favored for the formation of Earth's atmosphere and compares the present-day atmosphere to the early oxygen-lacking atmosphere. Links to related topics are included. Full description.
Grade level: High (9-12)
Resource type: Ref. material
Subject: Atmospheric science, Chemistry, Geologic time
 
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This document discusses the history of mass extinctions throughout geologic time, their role in the evolutionary process, and a mathematical model that demonstrates how the evolutionary process might interact with environmental stresses to produce a distribution of extinctions similar to that seen in the fossil record. Full description.
Grade level: High (9-12), College (13-14), College (15-16), Graduate / Professional
Resource type: Visualization - scientific, Ref. material
Subject: Geologic time, Paleontology, Mathematics
 
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Visitors to this site can learn about the theory of plate tectonics, the history of its development, and the mechanisms that drive the formation, movement, and destruction of continents and tectonic plates. A selection of animations depicts the movements of crustal plates and continents through time. Each animation is accompanied by an interactive time scale that provides links to descriptions of ... Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Tutorial, Illustration - scientific, Video, Ref. material
Subject: Geologic time, Geology, Paleontology
 
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NASA ED Mall Collection    Browse collection
DLESE Community Collection (DCC)     Browse collection
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This tutorial will help students learn and understand the concepts of geologic time and the age of the Earth. They will investigate the geologic time scale and learn about the use of index fossils and radiometric dating to determine the age of rock formations and fossils. Full description.
Grade level: High (9-12), College (13-14), College (15-16), General public
Resource type: Ref. material, Book - text
Subject: Geologic time, Geology, Paleontology
 
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During most of the last one billion years the globe had no permanent ice. However, sometimes large areas of the globe were covered with vast ice sheets. Users can read and view pictures which help explain what ice ages are, when they occurred, and why they occur. This site, sponsored by the Illinois State Museum, has links to web pages on paleontology of the midwestern United States during the last ... Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Photograph, Visualization - scientific, Ref. material
Subject: Cryology, Geologic time, Geology, Paleontology
 
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NASA ED Mall Collection    Browse collection
DLESE Community Collection (DCC)     Browse collection
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