| 41. | Paleontologists have identified dozens of mass extinctions, of which five stand out as especially severe.
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| 42. | Buried rocks record many prehistoric mass extinctions, when much earthly life disappeared, as if overnight.
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| 43. | I think fast climate change in any direction is one cause for mass extinction events.
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| 44. | Another mass extinction ended the reign of the dinosaurs.
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| 45. | Giant dinosaurs developed after this period and were killed off in a different mass extinction.
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| 46. | Various causes have been suggested for the mass extinction, from climate change to asteroid impacts.
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| 47. | Ward said he was drawn to the topic because of his studies of mass extinctions.
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| 48. | They note the lack of correlations in the fossil record between flips and mass extinctions.
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| 49. | Pages on extinction and the sixth mass extinction specifically.
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| 50. | "For them, the mass extinction of dinosaurs just meant a menu change, " said Ribeiro.
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