A brief overview illustrating the Paleozoic era in Earth's geologic history.

A collection of classroom lessons to help high school biology teachers teach evolution and the nature of science. This highly lab-oriented module is a very useful evolution and deep-time teaching site.

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,...

When is the best time to plant a tree? Learn all about bagged or burlapped trees. Links to other handy tools, including coloring pages, trivia, stories, games and fun projects.

How is time read on the stone of the Chaco Canyon? Find out systems geologists have for dating rocks and fossils.

A visualization activity where students can conceptualize the age of the Earth by observing dots on paper, making calculations and estimations, and discussing their findings with classmates.

Middle schoolers will learn about ancient organisms as they create a timeline showing when they appeared on Earth.

A map from 1910 of Mexico and Central America, showing the distribution of rocks and indicating the geologic time period they come from.

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

At this site from the NASA Classroom of the Future, you can learn about the many different layers of the earth and see what the earth would look like cut in half.

Locate all the most recent earthquakes on this interactive map. Data includes location, magnitude and time of the quake.

Sedimentary rock forms in layers that are deposited one after the other over long periods of time. Oftentimes, sedimentary rock contains fossils and other debris that are deposited within the layers. Use this experiment to investigate...

Over geologic time, plate movements in concert with other geologic processes, such as glacial and stream erosion, have created some of nature's most magnificent scenery. The Himalayas, the Swiss Alps, and the Andes are some spectacular...

A simulation that demonstrates divergent plate boundaries and seafloor spreading. A focus is on evidence of the Earth's normal and reversed polarity over geologic time in the rock record.

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...

Examine the enthralling world of the Irish elk by uncovering details about its behaviors, habitats, geological time periods, and classification through photos, a video, descriptions, and external links.

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.

Explore the exciting world of the woolly mammoth by discovering facts about its behaviors, habitats, geological time periods, and classification through news, photos, videos, descriptions, and external links.

Discover the fascinating world of the stingray by learning about its distribution, behaviors, habitats, geological time periods, and classification through videos, news, photos, descriptions, and external links.

Through five lessons, students are introduced to all facets of the rock cycle. Topics include rock and mineral types, material stresses and weathering, geologic time and fossil formation, the Earth's crust and tectonic plates, and soil...

An explanation of the Earth's atmosphere and how it has evolved over geologic time.

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

This interactive map of the US allows you to select among numerous streams and rivers to determine their current flow rate.

The Understanding Evolution site provides evidence for evolution in biogeography utilizing relative dating, geography, and plate tectonics.