A discussion of geologic time, along with a presentation of evidence for the time span involved.

Take a quick look at Earth's geologic time scale.

A discussion of geologic time, how scientists use the concept, and how they have determined its span.

Journey into the past while reading this comprehensive overview of the Hadean Eon that covers topics such as the formation of the earth, its surface and atmosphere, fossil evidence, erosion and plate tectonics.

Details regarding the geology of national parks in the United States.

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....

The geology of Alberta is profiled on this site. Drop menus reveal sub-topics ..geological time scale, rock formations in Alberta, and so forth.Graphics and maps are included.

An learning activity to help students grasp the concept of relative dating and geologic time.

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...

This in-depth article illustrates the concept of geologic time, and helps the learner understand why fossils are rare.

These time lapse movies of Kilauea are hosted by the Hawaiian Volcano Observatory. This resource also includes a webcam which provides near real time footage of two active volcanoes.

A detailed overview of the Earth's climate, with explanations about the difference between weather and climate, dendrochronology, palynology, and how Earth's climate has changed over time. All information is reinforced through pictures,...

Understanding Evolution provides evidence for evolution using fossils. There are also links to lesson plans.

Use this interactive to explore key human impacts on the environment and how they have affected Earth's landscape, ocean, atmosphere, and biodiversity. The column on the left-hand side of the screen lists different human impacts on the...

Explore the exciting world of the killer dinosaur, Tyrannosaurus Rex, by learning about its behaviors, geological time periods, and classification through descriptions, videos, photos, news, and external links.

This comprehensive study guide covers the main terms and concepts needed for a unit on the evolution of multicellular life.

This illustration from the Lunar and Planetary Laboratory shows the approximate sizes of the planets relative to each other. Note that the planets are not shown at appropriate distances from the Sun.

The breathable air we enjoy today originated from tiny organisms, although the details remain lost in geologic time. Scientific American helps uncover this mystery.

Describes plants and animals that lived during the Ordovician Period, where it falls in the geologic time scale, tectonic activity happening then, the climate and environment, and extinction events.

A landscape is part of the Earths surface that can be viewed at one time from one place. It consists of the geographic features that mark, or are characteristic of, a particular area. This resource examines different ways types of...

During your lifetime, you will use more than a million pounds of rocks, minerals, and metals. Dig through this web site and find out how.

How do scientists know how old the Earth is? What is radioactive dating? Are there other dating methods? Get the answers to these questions and others at this site presented by the Australian Museum Online.

Using diagrams and descriptive illustrations, this college-level biology reference book discusses the development of evolutionary theory.

To describe the diversity of unicellular organisms which arose over 2 billion years of evolution.