Mass Extinctions (Grade 10 NSC Matric Life Sciences): Flashcards
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Mass extinction definition
Mass extinction definition
Sharp decrease in plant and animal life on Earth
Number of major mass extinction events in Earth's history
Number of major mass extinction events in Earth's history
Five (the Big Five)
Most severe mass extinction event
Most severe mass extinction event
Permian-Triassic (90% marine, 70% land species)
Mass extinction that ended the age of dinosaurs
Mass extinction that ended the age of dinosaurs
Cretaceous-Paleogene (65 million years ago)
Current sixth extinction rate (species/year)
Current sixth extinction rate (species/year)
140,000 species per year
Primary cause of sixth mass extinction
Primary cause of sixth mass extinction
Human activities (hunting, habitat destruction)
Impact theory explanation
Impact theory explanation
Massive asteroid collisions with Earth cause extinctions
Volcanic activity theory explanation
Volcanic activity theory explanation
Massive volcanic eruptions cause climate change extinctions
Evidence for impact theory (crater location)
Evidence for impact theory (crater location)
600-km crater in India (65 million years ago)
Longest lasting mass extinction event
Longest lasting mass extinction event
Late Devonian (20 million years)