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Skittles & Space Skids
Have you ever wondered?...
How do scientists determine the age of Earth?
Why does Earth look so different from other celestial bodies?
When did life begin on Earth and how has it changed over time?
History of Earth (Crater Observation)
Celestial Bodies and Crater Images
World Map Impact Craters
Earth's Geological Processes Student Handout
Where Have All the Craters Gone? (Article)
BBC: The Late Heavy Bombardment
BBC: The Earth's Birth