Which circumstance could end life on Earth?
A. The sun continues to heat up. In a billion years, Earth gets too hot, oceans evaporate, carbon dioxide disappears, plant life dies out.
B. A massive asteroid smashes into Earth, vaporizing vast swaths of the surface and permanently changing the atmosphere.
C. Both of the above.
D. None of the above.
Answer:C
Which circumstance could end life on Earth?
A. The sun continues to heat up. In a billion years, Earth gets too hot, oceans evaporate, carbon dioxide disappears, plant life dies out. B. A massive asteroid smashes into Earth, vaporizing vast swaths of the surface and permanently changing the atmosphere. C. Both of the above. D. None of the above.