PBS Learning Media: Exploring Evidence of Earth’s Tilt
PBS Learning Media

Students explore patterns of observable phenomena, specifically duration of daylight and seasonal changes in the northern and southern hemispheres, to consider how the Earth–Sun relationship results in those observed patterns.

NASA Space Place: Earth

All about Earth!

OLogy: In Pictures - Beyond Planet Earth
OLogy (American Museum of Natural History)

What faraway places might humans travel to someday, and how will we get there?

OLogy: What is Earth?
OLogy (American Museum of Natural History)

Take a peek at our planet’s layers, learn what secrets rocks reveal, and gain a long view of history.