Talk Origins Archive
Talk Origins Archive: Radiometric Dating and the Geological Time Scale
A lengthy article with lots of information about radiometric dating, including pictures and charts.
Other
Planetary Society: Relative and Absolute Ages in Histories of Earth and the Moon
A lengthy scholarly article that discusses the geologic time scale, its history of development, age-dating events that occurred in different eras, and how absolute and relative dating are used to assess the ages of the Earth and Moon....
Other
Utah Geological Survey: How Do Geologists Know How Old a Rock Is?
Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in. The age of formations is marked on a geologic calendar known as the geologic time scale. Development of the...
New York Times
New York Times: Guantanamo Bay Naval Base
[Free Registration/Login Required] An account of Guantanamo Bay Naval and Prison Base in Cuba. From its beginnings in 1903 when the USA leased land from Cuba to its virtual isolation once Castro and American broke relations, followed by...
New York Times
New York Times: South Sudan
[Free Registration/Login Required] This site provides a concise overview of the history of South Sudan as well as links to the most recent news articles about the country. News articles date back to May 3, 2010.
New York Times
New York Times: L. Tammy Duckworth News
[Free Registration/Login Required] Provides a concise biography of Tammy Duckworth in addition to links to news articles concerning her military career and political aspirations that date back to 2005.
Khan Academy
Khan Academy: Common Questions About Dates
Our calendar is called the Gregorian calendar and was instituted by Pope Gregory XIII in 1582. There are many other calendars. Learn about these calendars and the meanings of B.C.E and C.E.
Khan Academy
Khan Academy: Timekeeping
Why do we need calendars and clocks? To survive in this complex society, you need to track what others are doing and when they're doing it. You also need to know what's happening in the natural world. This article discusses how/why...
Mocomi & Anibrain Digital Technologies
Mocomi: Prime Meridian Facts and Information
Discover fun facts about the International Date Line while learning about the Prime Meridian and Greenwich Meridian Time.
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.
Curated OER
Cbc.ca: A Timeline of Residential Schools
Need more facts about residential schools? This informative article is arranged in descending date order from the current government apology back in time to the inception of these controversial schools.
University of Missouri
Famous Trials: Molly Maguires Trials (1876 77)
In 1875, a writer of the time observed, there came from coal-mining district of Pennsylvania "an appalling series of tales of murder, of arson, and of every description of violent crime." Mine company superintendents and bosses "could...
A&E Television
History.com: How 25 Christmas Traditions Got Their Start
Christmas in America has been filled with traditions, old and new. Some date back to 16th-century Germany or even ancient Greek times, while others have caught on in modern times. Here's a look at 25 ways Americans have celebrated the...
A&E Television
History.com: How the Design of the World Trade Center Claimed Lives on 9/11
After the jets hit, stairwells became the sole means of escape for thousands of WTC occupants. But design choices hampered full evacuation -- and made the descent even more harrowing. The stairs in the twin towers were a product of their...
Khan Academy
Khan Academy: Guaman Poma and the First New Chronicle and Good Government
This letter written by Guaman Poma is the most famous manuscript from South America dated to this time period in part because it is so comprehensive and long, but also because of its many illustrations. View pictures of the illustrations...
Leaf Group
Classroom: How to Write a Research Paper Outline
This is an article focusing on gathering research information including paper requirements, citation information, and content, and then completing note cards and an outline.