Winter, spring, summer, and fall—Earth experiences them all! But what about Mars? Scholars compare the planets in terms of distance, tilt, and rotation during a lesson from PBS's Space series. Great visual models of Earth and Mars, plus...

Over more than a century, the global average temperature warmed 1.5F (0.8C). Learn the science of why this has happened, and what the future holds.

View a global map from NASA's Earth Observatory that shows land surface temperature from February 2000 to November 2008. Learn how land surface temperature is measured and monitored.

An animated model of the Earth from the Geophysical Fluid Dynamics Laboratory showing how global temperatures increased from 1870 to 2100 due to rising amounts of carbon dioxide in the atmosphere.

Through a simple online model, students learn about the relationship between average global temperature and carbon dioxide emissions while predicting temperature change over the 21st Century.

Take a trip in a "time machine" to see a series of pictures that show the how the climate of Earth has been changing. The indicators shown are: sea ice, sea level, carbon dioxide, and global temperature.

Students perform many inquiry activities related to Earth's orbit. Included are recording daily temperatures, observing the sun's path over several weeks, tracking sunrise and sunset times, and angle of sunlight. Diagrams make lessons...

Students perform many inquiry activities related to Earth's orbit. Included are recording daily temperatures, observing the sun's path over several weeks, tracking sunrise and sunset times, and angle of sunlight. Diagrams make lessons...

In this activity, use seasons to determine your location. Click on the different dates to view the earth's shadow at different times of the year from the sun's position.

Examine these graphs from the NOVA/ FRONTLINE Web site to see dramatic increases in the temperature of Earth's surface and greenhouse gases in the atmosphere.

A map from 1910 of the Indian subcontinent and the Central Asia region showing the typical rainfall distribution patterns during the summer monsoons, keyed to show areas of rainfall ranging from very light to, according to this text, the...

A map from 1910 of the Indian subcontinent and the Central Asia region showing the typical rainfall distribution patterns during the winter monsoons, keyed to show areas of rainfall ranging from very light to heavy rainfall. The map...