How many sterilizing impacts have occurred since the heavy bombardment?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Prepare for the Extraterrestrial Life Exam. Engage with in-depth quizzes, including flashcards and multiple-choice questions. Master the material with hints and explanations to boost your exam readiness!

Multiple Choice

How many sterilizing impacts have occurred since the heavy bombardment?

Explanation:
The idea tested is whether any event since the heavy bombardment has been powerful enough to wipe out all life on Earth's surface. A sterilizing impact would have to vaporize oceans and reset the biosphere, not just cause local damage or a mass extinction. Since that early bombardment period, Earth has not experienced an impact of that magnitude. We’ve seen large events that caused global crises and mass extinctions, but life persisted in deep oceans and underground, and ecosystems recovered after each event. Because there hasn’t been a true global sterilization since then, there have been none.

The idea tested is whether any event since the heavy bombardment has been powerful enough to wipe out all life on Earth's surface. A sterilizing impact would have to vaporize oceans and reset the biosphere, not just cause local damage or a mass extinction. Since that early bombardment period, Earth has not experienced an impact of that magnitude. We’ve seen large events that caused global crises and mass extinctions, but life persisted in deep oceans and underground, and ecosystems recovered after each event. Because there hasn’t been a true global sterilization since then, there have been none.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy