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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...
Other
How to Date a Fossil
Radiometric dating, fission-track dating, and amino-acid dating are explained in this succinct site.
Other
Parks Canada: Yoho National Park: The Burgess Shale
First discovered by Charles Walcott in 1909, the Burgess Shale is a UNESCO World Heritage site containing fossils dating back to the Cambrian period, 505 million years ago. This site provides the history of this area and information on...
Other
Massachusetts State Symbols
A thorough collection of the symbols of the state of Massachusetts including a picture, information about the symbol, and date of adoption.
NSTATE
Alaska State Symbols and Emblems
Find out all about the state symbols and emblems of Alaska. Clicking on the words under the heading "Symbol/Emblem" will usually provide a picture and more information. The date the symbol was adopted is also included.
NSTATE
Colorado State Symbols and Emblems
What are the state symbols of Colorado? Find them here, along with the date of their adoption, and links to pictures and more information.
Curated OER
National Park Service: Guadalupe Mountains
For over 10,000 years folks have been drawn to the Guadalupe Mountains in western Texas originally for its beauty, resources, and in more recent years its history. One of the most fascinating features to this national park is that in the...
Curated OER
National Park Service: Guadalupe Mountains
For over 10,000 years folks have been drawn to the Guadalupe Mountains in western Texas originally for its beauty, resources, and in more recent years its history. One of the most fascinating features to this national park is that in the...
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.
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...
Science Education Resource Center at Carleton College
Serc: Layer Cake Geology
Using a cake analogy, this activity teaches concepts such as: geologic time, rock layers, fossils, Law of Superposition, and relative dating. Activity can be modified to grade level and appropriate content for young scholars,
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Wbur: New England's Electric Power Grid Is Undergoing a Transformation
This article discusses New England's developing hybrid power grid, a network that relies on a variety of energy resources, including fuels and alternative energy sources and technologies. The ongoing transformation to renewable energy is...
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Bio Web Evolution: Homepage
This site from BioWeb Evolution was originally created as a ThinkQuest entry, and it has some good basic information about evolution. This page is on fossils and geologic time.
Curated OER
One of the Fossils (Photo: Geology/gsa)
Up-to-date science and technology news stories written just for kids, with audio. Learn about exploding stars, new dino discoveries, and whether lizards can help us learn how to scale walls like Spider-Man. Stories sometimes provide a...
US Geological Survey
U.s. Geological Survey: Geologic Time
A discussion of geologic time, how scientists use the concept, and how they have determined its span.
Science Education Resource Center at Carleton College
Serc: Geo Logic: The Big Five Mass Extinctions
Using GEOLogic puzzles, students are asked to match the five largest mass extinction events with their relative dates, approximate duration, and severity based on clues given from various perspectives.
Other
State of Mississippi: State Symbols
Here you'll find great information on the symbols for the state of Mississippi. Gives date of adoption, colorful pictures, and other important information about each symbol.
CK-12 Foundation
Ck 12: Earth Science: Age of Earth
[Free Registration/Login may be required to access all resource tools.] How scientists have been able to determine the age of Earth.
CK-12 Foundation
Ck 12: Earth Science: Age of Earth
[Free Registration/Login may be required to access all resource tools.] How scientists have been able to determine the age of the Earth.
CK-12 Foundation
Ck 12: Earth Science: Correlation Using Relative Ages
[Free Registration/Login may be required to access all resource tools.] How rock layers in different locations can be connected to make pictures of a region's geology.
CK-12 Foundation
Ck 12: Earth Science: Correlation Using Relative Ages
[Free Registration/Login may be required to access all resource tools.] How rock layers in different locations can be connected to make pictures of a region's geology.
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...
University of California
University of California Museum of Paleontology: Geologic Time
Learn about geologic time, including the age of the Earth by putting it in terms of pages in a book.
CK-12 Foundation
Ck 12: Fourth Grade Science: Earth Science: Relative Ages of Rocks
[Free Registration/Login may be required to access all resource tools.] Looks at how stratigraphy can be used to determine the relative ages of rocks, how unconformities occur, ways to match rock layers in different areas, and how...