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How Do We Know about Layers Deep within Earth?
Keycode: ES0402


What Time Is It?
Keycode: ES0405

Unit Investigations


Paper or Plastic—Which Type of Bag Is Better for the Environment?
Keycode: ESU201



Observe an animation showing the origin of the solar system.
Keycode: ES0401


Observe evidence of Earth rotating about an axis.
Keycode: ES0403


Explore a model of Earth's daily rotation.
Keycode: ES0404


Observe the view of the night sky from the same location over a year.
Keycode: ES0407


Explore a model of Earth's yearly revolution around the sun.
Keycode: ES0408

Data Centers


Learn more about how time is measured.
Keycode: ES0406


Learn more about methods of keeping time.
Keycode: ES0409



Careers for all chapters

Local Resources


Local Resources for Unit 2

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