US Geological Survey
The Numeric Time Scale
This is a good source for getting an in-depth description of using radioactive decay to measure the ages of rocks. In addition to describing the process of radiometric dating, this resource also includes a geologic time scale and four...
Woods Hole Oceanographic Institution
Woods Hole Oceanography Institute: Introduction to the Galapagos Islands
Find out how scientists at Woods Hole Oceanography Institute use radiometric dating to figure out the age of volcanoes. A slideshow of the history of radiometric dating can also be viewed.
![Ssec: How Can a Family Be in Poverty and Not Be Poor? [Pdf] Lesson Plan](https://d15y2dacu3jp90.cloudfront.net/images/attachment_defaults/resource/large/FPO-knovation.png "Ssec: How Can a Family Be in Poverty and Not Be Poor? [Pdf] Lesson Plan")
Social Science Education Consortium
Ssec: How Can a Family Be in Poverty and Not Be Poor? [Pdf]
This investigation helps learners examine issues related to measuring poverty. Is reducing poverty an appropriate economic role for government? How do you measure poverty? What is not examined when measuring poverty? What are alternative...
University of Texas at Austin
University of Texas: Texas Memorial Museum: Understanding Geologic Time [Pdf]
A lesson plan containing two activities for students to gain a better understanding of geologic time scale. The first activity allows students to get a visual of geologic time by role playing events in time on a football field. The...
CK-12 Foundation
Ck 12: Earth Science: Tree Rings, Ice Cores, and Varves
[Free Registration/Login may be required to access all resource tools.] How scientists can determine age and other features of a rock or material it contains.
CK-12 Foundation
Ck 12: Earth Science: Tree Rings, Ice Cores, and Varves
[Free Registration/Login may be required to access all resource tools.] How scientists can determine age and other features of a rock or other material.
Mocomi & Anibrain Digital Technologies
Mocomi: How to Determine the Age of a Tree
Have you ever looked at a tree and wondered just how long it had been standing there? The branches and the trunks of trees have unique rings inside them, which can be seen if you cut a transverse section of a tree. These rings appear as...
PBS
Pbs Teachers: Methuselah Tree
Examine how scientists determine the age of living and non-living trees and identify factors that impact sizes of tree rings. Analyze tree ring samples and determine the age of the oldest sample.
PBS
Pbs Nova Online: Lost at Sea the Search for Longitude
"The quest for a reliable method to find your way at sea was one of the thorniest problems of the 1700s." Find out about the search for longitude at this NOVA site. Includes interactive Shockwave game, learning activities and more.
New Advent
Catholic Encyclopedia: Hegelianism
Thorough introduction to Hegel's life and system, organized by headings. Includes German words for key concepts. Final section of twelve offers a critical appraisal of Hegelianism from Catholic perspective. Please note that ?The Catholic...
Curated OER
Paris Embellished and Expanded, Date Unknown
Historical overview of Louis XIV and XV reigns in France as a comparison between an absolute monarch and an enlightened monarch. Details the varying styles of two monarchs-one oppressive to the human spirit and a counter-cultural...
American Geosciences Institute
American Geosciences Institute: How Can We Tell How Old Rocks Are?
Find out how scientists can find out the age of the rocks they are studying.
Georgia Department of Education
Ga Virtual Learning: Geologic Time and Correlation
In this amazing interactive tutorial you will learn about what methods are used by geologists to learn about the history of the Earth. Investigate a geologic time scale and learn about how scientists have developed and organized a record...
Curated OER
Educational Technology Clearinghouse: Maps Etc: United States, 1821
A map of the United States and territories in 1821 after the Missouri Compromise, showing the Free States and territories, the Slave States and territories, and the transitional territories at the time. The map is color-coded to show the...
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