NASA
Nasa: Earth: Overview: Our Home Planet
Provides a comprehensive look at the planet Earth including photos, how Earth got its name, and facts and figures about its size, seasons, moon, atmosphere, rotation, and lithosphere.
PBS
Pbs Learning Media: Link Between Arctic Sea Ice and Solar Radiation Absorbed
The Arctic plays an important role in regulating Earth's climate. The region reflects much of the Sun's energy and helps keep the planet cool. Data collected by NASA have revealed that sea ice in the Arctic has steadily declined over the...