How will life on Earth end? (astronomy.com) - Comprehension

Introduction: When did the first living things appear on Earth?

• 6 billion years ago

• 4 billion years ago

• 2.5 billion years ago

• 1 billion years ago

Asteroid Impact Apocalypse: What event caused the extinction of dinosaurs?

• Supernovae blast

• Asteroid impact

• Volcanic eruption

• Climate shift

Asteroid Impact Apocalypse: How often does Earth get hit by a large asteroid?

• Every 500 million years

• Every 100 million years

• Every 50 million years

• Every 10 million years

Death by Deoxygenation: What two things caused the Late Ordovician mass extinction?

• Deoxygenation

• Gamma-ray burst

• Climate shift

• Volcanic eruption

Death by Deoxygenation: What is the potential impact of climate change on oxygen levels in our oceans?

• Stabilize oxygen levels

• Decrease oxygen levels

• No impact on oxygen levels

• Increase oxygen levels

Gamma-ray Burst Extinction: What are gamma-ray bursts (GRBs) believed to be tied to?

• Volcanic eruptions

• Supernovae

• Climate shifts

• Asteroid impacts

Gamma-ray burst extinction: Which of the following would happen if a gamma-ray burst (GRB) hit Earth? (check all that apply)

• Lifeforms that live in the upper levels of the ocean would die

• It would break apart gases in the atmosphere, which would create smog

• Decrease ozone levels

• Strengthen the ozone layer

End of the Sun: What is the ultimate fate of most life on Earth in about a billion years?

• Extinction due to climate shift

• Extinction due to volcanic eruption

• Extinction due to deoxygenation

• Extinction due to asteroid impact

Death by Deoxygenation: What caused the Great Oxidation Event?

• Volcanic eruption

• Asteroid impact

• Cyanobacteria (AKA blue-green algae) eruption

• Supernovae blast

End of the Sun: What is the result of deoxygenation?

• Stabilize oxygen levels

• No impact on oxygen levels

• Decrease in oxygen levels

• Increase in oxygen levels