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Questions tagged [mass-extinction]

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Could the current climate change events cause long-term problems in the viability of Earth to sustain life?

There are a lot of reports on the consequences of climate change for the relative short term. From what I understand, in the next 100 years or so, we will face: global floods of coastal areas, ...
6
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2answers
68 views

Why are pole reversals not more detrimental to life?

This question is linked to the following question, and has two parts. Mars interdicts approximately 40% of the radiation (per square meter) of the sun that Earth does. It has been claimed that Mars ...
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2answers
82 views

What if we detonated the entire worlds nuclear supply in the center of the earth? [closed]

What would the effects of detonating every single nuclear bomb currently in existence at once in the center of the earth? Would the earth simply explode into bits? Would the heat have some sort of ...
11
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2answers
3k views

Is it possible that the geomagnetic field reversal led to the extinction of Dinosaurs?

Is it possible that the geomagnetic field reversal with a weakened geomagnetic field over centuries if not thousands of years (according to the Pittsburgh simulation: https://www.psc.edu/science/...
2
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1answer
119 views

Permian-Triassic mass extinction. Consequences on Earth's system

Coming from this post: Causes of fluctuations in atmospheric oxygen in past 300 Mya I believe there are a lot of questions still unanswered about Permian-Triassic mass extinction, but I ask only ...
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1answer
158 views

Safest spots when an asteroid hits? [closed]

I am breaking this question and no longer making an effort in refining it with the exception of adding an associated link with the scenarios. I always wondered if a devastating asteroid was ...
2
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0answers
56 views

How does extinction caused by human activity compare to extinction caused by glaciation?

When or if the current interglacial ends, what sort of extinction level can we expect, and what sort of organisms and ecosystems are affected ? How does this compare with the current extinction rate, ...
1
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1answer
98 views

gamma ray burst, extinction-level event

From this subsection in Wikipedia's aricle on extinction event: A nearby gamma-ray burst (less than 6000 light years away) would be powerful enough to destroy the Earth's ozone layer, leaving ...
7
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1answer
1k views

How is geological time divided into units?

Earth's history is divided into eons, which are divided into eras, which are divided into periods etc. Consecutive time units differ in their geology and/or fossil species. But what events are the ...
3
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0answers
88 views

Connections between marine and terrestrial ecosystems [closed]

First I would like to note that I have only very basic understanding of ecology, biology and paleontology so I can easily miss something very simple. I can envision certain ways marine and ...
4
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1answer
112 views

Percentage of Oxgen left after burning all the available biomass

A documentry stated that during the Permian asteroid strike the atmosphere heated up to above 400C, potentially to 600C. As this would ignite most of the biomass, including us, I wondered if this fire ...
2
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2answers
186 views

Recovery From the Great Dying

252 million years ago, Earth underwent its worst, most violent chapter in the form of the Permian-Triassic extinction event, or "The Great Dying". 70% of the terrestrial species and 95% of the marine ...
6
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1answer
688 views

How long does earth take to recover from mass extinctions? What is “normal”?

Wikipedia states the following about the P-Tr extinction event: "Because so much biodiversity was lost, the recovery of life on Earth took significantly longer than after any other extinction event,[5]...
5
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1answer
122 views

Why haven't weeds overtaken the entire planet?

Given how rapidly weed plants spread and grow, choking out all other plant life, how come after millions of years we haven't ended with forests full of thistle or pokeweed, as opposed to pines or oak ...
1
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1answer
326 views

What is the natural replenishment rate of oil? [duplicate]

What is the natural replenishment rate of oil? Are extinction events connected with higher production?
9
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1answer
255 views

Why is the concept of “mass extinction” a relatively recent development in geology?

The concept of "mass extinctions", with its catastrophic connotations, is a relatively recent development in the geological sciences. It evolved in the early 1980s, driven by two landmark publications ...
10
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2answers
292 views

Did a gamma ray burst contribute to the Ordovician mass extinction?

According to the University of California Museum of Palaontology webpage The Ordovician Period, the late Ordovician period witnessed when Gondwana finally settled on the South Pole during the Upper ...
10
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1answer
110 views

Are there any metal anomalies other than iridium in the K-Pg boundary?

The iridium anomaly marks the elevated concentration of iridium in sedimentary deposits of the Cretaceous-Paleogene boundary. The iridium is said to come from the impactor, which is supposed to have ...
10
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1answer
421 views

Is the Younger Dryas associated with an extinction event?

It's often said that, while warming and cooling have happened before, what is unusual about the current anthropogenic warming is that it's happening so fast, relative to previous warming phases$^1$. ...
7
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2answers
800 views

Life on Earth previous to us

I've seen in several places that there seems to be an extinction cycle on Earth of approximately 27 million years. I've read this here: http://www.dailymail.co.uk/sciencetech/article-1294372/Life-...
9
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1answer
231 views

What evidence is there that plant evolutionary history “dances to a different beat” than that of animals?

Floral transformations have been due to gradual replacement and piecemeal, not mass extinction. Plant “geoevents”; have not been synchronous with epochal animal originations/ extinctions and hence ...