--- title: "Volcanoes & Mass Extinctions" description: "Describe large igneous provinces and how large carbon dioxide releases can warm Earth and change ocean chemistry. Connect Siberian Traps volcanism with the end-Permian extinction. Distinguish the aste" canonical: https://lightmysky.com/learn/science/volcanoes-and-mass-extinctions-mt_QwWo6an9N1 source: https://lightmysky.com/learn/science/volcanoes-and-mass-extinctions-mt_QwWo6an9N1.md retrieved: 2026-11-12 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Volcanoes & Mass Extinctions Describe large igneous provinces and how large carbon dioxide releases can warm Earth and change ocean chemistry. Connect Siberian Traps volcanism with the end-Permian extinction. Distinguish the asteroid's role at the end-Cretaceous from the debated contribution of Deccan volcanism. Discuss hydrothermal vents as a possible setting for life's origin. Subject: Science · Area: Volcanoes & Earthquakes · Ages 13 to 14 Page: https://lightmysky.com/learn/science/volcanoes-and-mass-extinctions-mt_QwWo6an9N1 ## Ready when they can - Describe a large igneous province as an extensive region of igneous rock formed from huge amounts of magma - Distinguish greenhouse warming by carbon dioxide from temporary cooling by sulfate aerosols - Explain how absorbed carbon dioxide changes seawater chemistry and can hinder shell building - Connect the Siberian Traps with the end-Permian extinction and the Deccan Traps with the end-Cretaceous interval - Distinguish evidence supporting an origin-of-life hypothesis from proof of that hypothesis - Calculate the percentage-point difference between two supplied percentages ## Lesson: Volcanism and Mass Extinctions You have considered uncertain forecasts. Rocks and fossils also help scientists investigate uncertain explanations of ancient events. A large igneous province, or LIP, is a vast region of igneous rock formed from huge amounts of magma. It can include lava flows and magma that hardened underground. Repeated eruption pulses may occur within a history lasting hundreds of thousands to millions of years. *(drawing: CO2 can change ocean chemistry through absorption and reaction with water. Warming is a separate effect.)* Carbon dioxide, or CO2, is a greenhouse gas. Large releases can increase heat retention and warm Earth. Sulfur dioxide has a different pathway: high in the atmosphere, it can form sulfate droplets that scatter sunlight and cool Earth for a few years. These effects have different durations. A large volcanic event can affect climate through both pathways. Acidic, neutral and alkaline describe water's chemistry. Water can become more acidic while remaining on the alkaline side of neutral. The ocean absorbs some atmospheric CO2. It reacts with water to form carbonic acid, increasing acidity while seawater remains alkaline overall. This can make calcium carbonate shells and skeletons harder to build. Warming can also reduce dissolved oxygen and alter ocean circulation. These stresses affect species differently. **Example.** About 252 million years ago, Siberian Traps volcanism in what is now Russia was linked to the end-Permian extinction, called the Great Dying. Large greenhouse-gas releases contributed to severe warming. Ocean oxygen loss and acidification added stress. A mass extinction is a large loss of species over a geologically short interval. This was the largest known mass extinction, but life survived. **Example.** About 66 million years ago, Deccan Traps eruptions in what is now India overlapped the end-Cretaceous interval. Evidence strongly supports the Chicxulub asteroid impact as the main trigger of that mass extinction. Deccan volcanism's contribution remains debated. All non-bird dinosaurs disappeared, but birds survived. Overlapping dates alone cannot show how much each event contributed. Hydrothermal vents release heated water containing dissolved minerals. Some microbes use chemical energy from vent environments rather than sunlight. Scientists investigate whether such environments supported reactions involved in life's origin. Vents are a proposed setting, not a proven birthplace of the first cells. Hot springs are another proposed setting. To compare percentages, subtract them and report the gap in percentage points. For example, two fictional surveys show losses of 55% and 20% of their starting species. The gap is 55 minus 20, or 35 percentage points. This is different from saying 35% more. Historical extinction percentages are estimates based on particular fossil records, not exact counts of all life. **Recap.** Large volcanic gas releases can change climate and ocean chemistry. Evidence links volcanism with past extinctions, while some causal roles and life's origin remain uncertain. *Lesson, questions and flashcards written for this learning dataset.* ## Practice 8 questions on this page, each with its working shown. ## Needs first - [Hazard Assessment & Evacuation](https://lightmysky.com/learn/science/hazard-assessment-and-evacuation-mt_edaoZRkK6M) - [How Rocks Change Over Time](https://lightmysky.com/learn/science/how-rocks-change-over-time-mt_z7AJZapsJj) ## Optional connections - [Supervolcanoes & Volcanic Winter](https://lightmysky.com/learn/science/supervolcanoes-and-volcanic-winter-mt_Am_iTzHjoe) ## Opens up - [The Carbon Cycle on Two Timescales](https://lightmysky.com/learn/science/the-carbon-cycle-on-two-timescales-mt_OXBubQOPk7)