Khan Academy
Khan Academy: Threshold Card: Threshold 9 the Future
What does the future hold? Use your knowledge of Big History and your understanding of the eight major thresholds we've studied to predict Threshold 9. Download the attached PDF to record your answers.
Khan Academy
Khan Academy: Claim Testers: Episode 2 Barren Worlds
The claim-testing gang comes face-to-face with a living organism from another planet and learn what conditions are perfect to support life on a planet.