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The first one was of the dinosaurs. I think it was the cretaceous period, but not sure. the widely accepted cause was a giant meteor that crashed into the Gulf of Mexico, causing a dramatic climate change that the dinosaurs could not adapt to. The second one was of the 'magafauna', or large animals, of the North American ( and I think of the South American ) continent. The animals included the wooly mammoth, giant sloth, saber-tooth tiger, etc. This happened about 15,000 years ago. In a science program currently running on TV, it is shown that scientists have found startling new evidence that this extinction was ALSO caused by a meteor - most likely several small meteors - crashing into earth.
What else can I help you with?
What is a probable cause of two mass extictions?
For all mass extinctions (except the Cretaceous/Paleogene extinction) two probable causes are volcanic eruptions and ocean anoxia.
What are two catastrophic events that can cause mass extinctions?
An asteroid from space, and Gradualevents
What are two things that can cause mass extinctions?
ice age,Noahs flood in bible
If the atomic mass of bromine is 79.904 atomic mass units and bromine has two major isotopes of similar abundance both approximately 50 percent what is the atomic mass of each isotope?
explanation about atomic mass of bromineIsotope Atomic mass Abundance(%) 79Br 78.91834 50.6981Br 80.91629 49.31therefore:Atomic mass of bromine element = 78.91834x0.5069+80.91629x0.4931= 79.904
What is the relationship between humans and extinctions?
human activities appear to have eliminated two or three species per decade, about double the naturalextinction rate.
What is a probable cause of two mass extictions?
For all mass extinctions (except the Cretaceous/Paleogene extinction) two probable causes are volcanic eruptions and ocean anoxia.
What are two catastrophic events that can cause mass extinctions?
An asteroid from space, and Gradualevents
Why do you think most extinction's occur as background extinctions?
Most extinctions occur as background extinctions because they are longer time periods unlike the shorter mass extinctions which there were only two in the Paleozoic era, the Ordovician mass extinction, and the Permian/Triassic extinction in which 95% of all marine animals became extinct
What are two things that can cause mass extinctions?
ice age,Noahs flood in bible
What is an probable cause of two Mass extinctions?
Two probable causes of mass extinctions are volcanic activity and asteroid impacts. Massive volcanic eruptions can release large amounts of ash and gases, leading to climate changes and disrupting ecosystems. Similarly, asteroid impacts can cause immediate destruction and trigger long-term environmental shifts, such as blocking sunlight and altering temperatures, resulting in the collapse of food chains. Both phenomena have been linked to significant biodiversity loss in Earth's history.
How many extinctions has earth experienced in its history?
Mass extinctions--at least two--one at the end of the Permian, and one at the end of the Cretaceous, with numerous other less severe events. As far as the extinction of individual species, that list would cover millions of extinct organisms.
What are the two major properties of Matter?
Matter has mass and occupies space. So, mass and volume are the two major properties of matter.
Which eras ended with a mass extinction?
Two major eras that ended with mass extinctions are the Permian-Triassic extinction event, which marked the end of the Permian period, and the Cretaceous-Paleogene extinction event, which marked the end of the Cretaceous period. These events had profound impacts on life on Earth, leading to the loss of a significant number of species.
what two periods were there mass extinctions of life on earth?
Two significant periods of mass extinction on Earth include the Permian-Triassic extinction, approximately 252 million years ago, which wiped out about 90% of marine species and 70% of terrestrial vertebrates. Another major event is the Cretaceous-Paleogene extinction, around 66 million years ago, famously associated with the asteroid impact that led to the demise of the dinosaurs and about 75% of species on Earth.
What two influences causes changes in the motion of objects?
mass and acceleraiton
Adaptation and pictures of animals in shrubland?
What are two natural factors that caused an extinctions
What was the major cause of emigration after the civil war?
The two major causes were the Homestead Act and the completion of the Transcontinental Railroad.
