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Either even could eject aerosols that would turn into global acid rain, scatter hot debris that would igniteforest fires, or give off chemicals that, when dissolved in the ocean, would make the ocean either toxic, killing marine life, or so nutritious that oxygen-consuming algae could thrive. Appearance of a new predator or competitor:appearance of first humans on the continent explains the mass extinction that occurred during the past 20,000 years, when a vast number of large mammal species vanished from North America. More efficient competitor appears, steals ecological niche from the weaker species, whose members can’t obtain enough food to survive.Mass extinction events:late Paleozoic Era came to a close:oPermian-Triassic extinction: due to eruption of 3 million cubic km of basalt in Siberia.o95% of marine species disappeared. Terminal Permian mass extinction occurred as a result of extraordinary volcanic activity in Siberia, basalt sheets extruded during the event. Eruptions could have clouded the atmosphere, acidified the oceans, and disrupted the food chain. K-T boundary eventoCretaceous-Tertiary extinction: due to a giant meteorite impact near the Yucatán peninsula in Mexicooend of Cretaceous Period, 65 million years agoodinosaurs which had ruled the planet for over 150 million years, simply vanished, along with 90% of plankton species in the ocean, and up to 75% of plant species.oHuge meteorite impact. Generated 2-km-high tsunamis that inundated the shores of continents and generated a blast of hot air that set forests on fire. Blast could have ejected so much debris that for months there would have been perpetual night and winter-like cold. Mt.toba maybe?Megathrust earthquakes
A megathrust earthquake occurs in subduction zones where two crustal plates are colliding. They have occurred in the Cascadia Subduction Zone in the past and scientists predict another will occur.The 2012 Chile Earthquake (9.5 Mw) and the 2011 Japanese earthquake (9.0 Mw) were earthquake megathrust events.The 2012 Chile Earthquake (9.5 Mw)Magnitude of 9.5 Mw (or 8.8 idk) intense shaking for 3 minutesFelt in 6 Chilean Regions00 from Valparaiso in the North to Araucaria in the South (80% of country's populationEarthquake triggered a tsunami which devastated several coastal towns in south-central Chilie and damaged the port of TalcahuanoBlackout—affected 93% of the Chilean population—several days in some location1964 Gulf Of Alaska Earthquake (9.2 Mw)The 1964 Alaskan earthquake, also known as the Great Alaskan earthquakeandGood Friday earthquake, occurred at 5:36 PM ASTon Good Friday, March 27.Across south-central Alaska, ground fissures, collapsing structures, and tsunamis resulting from the earthquake caused about 139 deaths.Lasting four minutes and thirty-eight seconds, the magnitude 9.2 megathrust earthquakewas the most powerful recorded in North Americanhistory, and the second most powerful recordedin world history.