During the last age, the largest North American rodent was the Giant Beaver. It is profiled here.

How do greenhouse gases affect the climate? Explore the atmosphere during the ice age and today. What happens when you add clouds? Change the greenhouse gas concentration and see how the temperature changes. Then compare to the effect of...

How do greenhouse gases affect the climate? Explore the atmosphere during the ice age and today.

A map from 1911 showing the glacial lake succession of the Ontarian Ice Lobe in New York state, Lake Iroquois.

Uncover discoveries from the past by learning about the prehistoric Jefferson's ground sloth. Includes information about the time period, physical characteristics, fossil specimens, feeding habits, and habitat.

Uncover discoveries from the past by learning about the prehistoric American mastodon. Includes information about the time period, physical characteristics, fossil specimens, feeding habits, and habitat.

Uncover discoveries from the past by learning about the prehistoric North American scimitar cat. Includes information about the time period, physical characteristics, fossil specimens, feeding habits, and habitat.

Uncover discoveries from the past by learning about the prehistoric giant beaver. Includes information about the time period, physical characteristics, fossil specimens, feeding habits, and habitat.

Uncover discoveries from the past by learning about the prehistoric camels of the Yukon and Alaska. Includes information about the time period, physical characteristics, fossil specimens, feeding habits, and habitat.

Uncover discoveries from the past by learning about the prehistoric ancient caribou. Includes information about the time period, physical characteristics, fossil specimens, feeding habits, and habitat.

Uncover discoveries from the past by learning about the prehistoric Yukon horse. Includes information about the time period, physical characteristics, fossil specimens, feeding habits, and habitat.

Uncover discoveries from the past by learning about the prehistoric Beringian lion and the American lion that evolved from it. Includes information about the time period, physical characteristics, fossil specimens, feeding habits, and...

Uncover discoveries from the past by learning about the prehistoric North American saiga. Includes information about the time period, physical characteristics, fossil specimens, feeding habits, and habitat.

Lots of information here about glaciation, types of glaciers, the formation of glacial ice, changes in glacier size, how glaciers move, glacial erosion, landforms produced by glaciers, glacial deposition and drift, effects of glaciation...

Detailed analysis of the spread of malaria in England owing to changes in climate during the sixteenth and seventeenth centuries.

This video segment adapted from NOVA explains the difference between weather and climate and features groundbreaking analysis revealing that Earth's climate has changed much faster than previously believed. [5:48]

A discussion of a migration theory of Paleoindians that went down the west coast of North America. Read about food sources, the geology, and the research behind the theory.

This is Chapter One from "Becoming Human: Evolution and Human Uniqueness," by Ian Tattersall. This chapter presents recent findings about the art and artifacts of early humans, and what those artifacts tell us about the intellectual...

Read about the discoveries of the Spirit Lake Man and Wizard's Beach Man.

Investigate glaciers past and present through this website that explores glaciers found in the National Park Service.

A nicely organized, detailed history of the state of Maine.

This virtual field trip for middle school students looks at aquifers and their place in the hydrologic cycle. Students learn why and how it is important to protect the source of your drinking water and some unique details about the...

In this article about global warming, learn how the warming climate could affect the polar ice caps, glaciers, sea ice, and amount of freshwater entering the polar oceans. Read how some scientists believe global warming could add to...

Students discover how tree age can be determined by studying the rings, and how ring thickness can be used to deduce times of optimal growing conditions. Then they investigate simulated tree rings applying the scientific method to...