European Space Agency
European Space Agency: Esa Kids: Our Universe: Earth
A basic overview of the planet Earth. Links to information about the other planets and objects in our solar system are included.
Utah Education Network
Uen: Trb 3:1: Investigation 4: Day and Night
A activity for third graders in which they learn about the rotation of the Earth on its axis and how this movement creates day and night. They also examine the orbit of the moon about the Earth and the Earth's orbit around the sun.