Would you like a custom set of questions and answers based on a specific timestamp or theme from Episode 9?

Here’s a useful write-up for educators, students, or self-learners looking for answer keys to the Cosmos: A Spacetime Odyssey Episode 9 worksheet (titled “The Lost Worlds of Planet Earth” ). Episode 9 of Cosmos: A Spacetime Odyssey , hosted by Neil deGrasse Tyson, explores the dynamic geological history of Earth. It covers continental drift, mass extinctions, the evolution of life, and how our planet’s changing environment has shaped—and been shaped by—living organisms. The episode emphasizes the importance of fossils and the insights they provide into Earth’s future.