Mass Extinctions in Earth History

Question 1

Which of the following lists the five major mass‑extinction events in the correct chronological order, including their approximate ages?

Accepted Answer

End‑Ordovician (~444 Ma) → Late Devonian (~375 Ma) → End‑Permian (~252 Ma) → End‑Triassic (~201 Ma) → Cretaceous‑Paleogene (K‑Pg, ~66 Ma)

Answer

Late Devonian (~375 Ma) → End‑Ordovician (~444 Ma) → End‑Permian (~252 Ma) → End‑Triassic (~201 Ma) → K‑Pg (~66 Ma)

Answer

End‑Ordovician (~444 Ma) → End‑Permian (~252 Ma) → Late Devonian (~375 Ma) → End‑Triassic (~201 Ma) → K‑Pg (~66 Ma)

Answer

End‑Ordovician (~444 Ma) → Late Devonian (~375 Ma) → End‑Permian (~252 Ma) → End‑Triassic (~201 Ma) → K‑Pg (~100 Ma)

Question 2

Which statement correctly explains why the End‑Permian extinction is regarded as the deadliest mass‑extinction event and how the Siberian Traps volcanism caused it?

Accepted Answer

The Siberian Traps eruptions released vast amounts of carbon dioxide, causing extreme global warming that led to widespread ocean anoxia and the loss of about 96% of marine species, making this event the most severe.

Answer

The Siberian Traps eruptions threw billions of tons of ash into the atmosphere, cooling the planet for decades and causing a short ice age that killed the most species.

Answer

An asteroid struck the Earth at the same time as the Siberian Traps eruptions, and the impact alone was responsible for the greatest loss of life.

Answer

The Siberian Traps volcanoes erupted only locally, but a sudden drop in sea level isolated habitats and led to the biggest extinction.

Question 3

Which statement best explains why the End‑Permian event is regarded as the deadliest mass extinction and accurately links it to the Siberian Traps eruptions and their atmospheric impact?

Accepted Answer

It eliminated roughly 90 % of marine species and 70 % of terrestrial species; the cause was the massive flood‑basalt eruptions of the Siberian Traps that released vast amounts of carbon dioxide, triggering rapid global warming, ocean acidification and widespread low‑oxygen (anoxic) conditions.

Answer

It wiped out most dinosaurs; the main cause was an asteroid that struck the Siberian region, throwing dust into the atmosphere that blocked sunlight and caused a planet‑wide cooling.

Answer

It was the most severe because the Siberian Traps spewed large quantities of sulfur gases that produced a permanent global ice age, killing organisms by extreme freezing.

Answer

It killed a similar proportion of life as the End‑Ordovician, but scientists rank it higher because it occurred later in Earth’s history, giving it a larger influence on later evolution.

Try three questions

Which of the following lists the five major mass‑extinction events in the correct chronological order, including their approximate ages?

Which statement correctly explains why the End‑Permian extinction is regarded as the deadliest mass‑extinction event and how the Siberian Traps volcanism caused it?

Which statement best explains why the End‑Permian event is regarded as the deadliest mass extinction and accurately links it to the Siberian Traps eruptions and their atmospheric impact?

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