This site from the The Minneapolis Institute of Arts provides a full color map that details the expanse of the Yuan Dynasty from 1280 - 1365 A.D.

At this site from the Missouri Botanical Garden, you can learn about conifers, needles and the taiga in the fall. Click on the pictures to view a larger version.

When two or more atoms combine they give rise to a molecule. A molecule can be made up of many atoms of the same element. There are 112 elements known to man, so can you imagine the different permutations and combinations of molecules that can exist freely in nature or be synthesized in a laboratory? [1:58]

Use this site for lots of different ideas on how to make a model of a neuron.

This video from Nature features the start of the monarch butterfly's northward trek. [3:02]

Content specific and supporting materials and resources for online and blended learning are critical to meet the differing learning styles of today's learners. In this session, multiple sources of free multimedia resources will be shown as well as demonstrations of how to embed these resources into popular learning management systems and web tools.

Use this site to learn about the millions and trillions of gallons of water that covers the earth, known as the hydrosphere.

View a satellite image of the Ganges river delta. Click on the image to see a more detailed picture.

Read about Earth's oceans and the effects that climate have had on the rising temperatures over the past one hundred years. Discover how the Earth's ocean and atmosphere are interlocked so that when one changes, the other is affected.

This impressive compilation of ideas is a great source for space science. Loaded with extra links for further information on the solar system.

NASA site explores what a comet's nucleus is composed of. Animation and photographs are provided as well.

An introduction to the Sun including its size and distance from the Earth, sunspots, flares and coronal mass ejections.

This site from NASA provides an excellent tutorial on vectors and their use in physics to describe the motion of objects. Vector addition and resolution are illustrated.

This resource provides a detailed description of both structure and function of the kidneys, the role they play in the urinary system, as well as provides information about kidney disease.

A quick overview of how a combined sewer overflow system works, and why heavy rains can be bad for estuaries. [1:42]

Follow this group of students through their scavenger hunt in the estuary. Take a look at the living and nonliving things that make this ecosystem a special place. [9:38]

A great resource for explaining and understanding tides. Find out what tides are and why it is so important to monitor them. This is an extensive tutorial followed by a set of review questions. All of the information can be downloaded as a 36-page PDF file.

Explains what eutrophication is and the extent of the problem in the United States. Discusses the causes, impact, and what can be done to combat it. The video provides a short overview of the topic and is accompanied by a transcript. [1:04]

This page tells you what El Nino is, provides links to animations and videos on El Nino, explains how to recognize El Nino, and discusses the history of significant El Nino events.

Many species that have been introduced for the purpose of dealing with a problem such as erosion or a rat epidemic, instead become invasive. How can these invasive species be eradicated? Eminent ecologist Dan Simberloff explains some of the strategies that can be used to eliminate invasive species.