earth the biography rare earth 1

Rare Earth: Questions for Earth the Biography Rare Earth

After viewing the video: Earth the Biography Rare Earth, answer the following questions:

1. What is the Rare Earth Theory?

2. List three things that happened which resulted in Earth being able to support complex life:

3. How did the asteroid impact at the end of the Cretaceous period affect life on our planet?

4. What is currently the greatest threat to Earth?

5. After the 4.6 billion years for the Earth to evolve from a barren rock into the world we know today, what are the challenges currently facing the earth from humankind?

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