Volcanoes & Mass Extinctions

Question 1

You are drawing a simple diagram that shows the two giant flood‑basalt provinces and lines pointing to the mass‑extinction events they are believed to have caused. Which labeling is correct?

Accepted Answer

Siberian Traps – connected to the end‑Permian extinction; Deccan Traps – connected to the end‑Cretaceous extinction.

Answer

Siberian Traps – connected to the end‑Cretaceous extinction; Deccan Traps – connected to the end‑Permian extinction.

Answer

Siberian Traps – connected to the Triassic‑Jurassic extinction; Deccan Traps – connected to the end‑Permian extinction.

Answer

Siberian Traps – connected to the end‑Permian extinction; Deccan Traps – connected to the Triassic‑Jurassic extinction.

Question 2

Which paragraph most accurately describes how a massive flood‑basalt province such as the fictional "Kara Kulla Traps" could trigger global warming and ocean acidification that helped cause a mass‑extinction event?

Accepted Answer

The Kara Kulla Traps erupted for several million years, spewing enormous amounts of carbon dioxide (CO₂) and sulfur dioxide (SO₂) into the atmosphere. The CO₂ acted as a greenhouse gas, trapping infrared radiation and raising global temperatures. Over time, some of that CO₂ dissolved in seawater, forming carbonic acid and lowering the ocean’s pH, which harmed marine organisms and contributed to a widespread extinction.

Answer

The eruptions of the Kara Kulla Traps released huge clouds of volcanic ash that blocked sunlight, cooling the planet’s surface. The cooler climate reduced the amount of dissolved oxygen in the oceans, leading to dead zones where marine life could not survive.

Answer

When the Kara Kulla Traps erupted, the volcanic gases primarily reflected sunlight, causing a long‑term cooling of the climate. At the same time, sulfur gases fell as acid rain, which killed plants on land but had little effect on the oceans.

Answer

The lava flows from the Kara Kulla Traps poured directly into the oceans, heating the water and sterilizing marine habitats. The heat alone was enough to cause a rapid loss of species without involving any atmospheric gases.

Question 3

A student is drawing a quick diagram that includes the two giant flood‑basalt provinces and the mass‑extinction events they are thought to have caused. Which combination of labels and connecting arrows would be drawn correctly?

Accepted Answer

Label the left side "Siberian Traps (≈252 Ma)" and draw an arrow from it to "End‑Permian extinction (≈252 Ma)"; label the right side "Deccan Traps (≈66 Ma)" and draw an arrow from it to "End‑Cretaceous extinction (≈66 Ma)".

Answer

Label the left side "Siberian Traps (≈252 Ma)" and draw an arrow from it to "End‑Cretaceous extinction (≈66 Ma)"; label the right side "Deccan Traps (≈66 Ma)" and draw an arrow from it to "End‑Permian extinction (≈252 Ma)".

Answer

Label the left side "Siberian Traps (≈66 Ma)" and draw an arrow from it to "End‑Permian extinction (≈252 Ma)"; label the right side "Deccan Traps (≈252 Ma)" and draw an arrow from it to "End‑Cretaceous extinction (≈66 Ma)".

Answer

Write "Siberian Traps" and "Deccan Traps" on the diagram, but do not connect them with any arrows to extinction events.

Try three questions

You are drawing a simple diagram that shows the two giant flood‑basalt provinces and lines pointing to the mass‑extinction events they are believed to have caused. Which labeling is correct?

Which paragraph most accurately describes how a massive flood‑basalt province such as the fictional "Kara Kulla Traps" could trigger global warming and ocean acidification that helped cause a mass‑extinction event?

A student is drawing a quick diagram that includes the two giant flood‑basalt provinces and the mass‑extinction events they are thought to have caused. Which combination of labels and connecting arrows would be drawn correctly?

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