Difference between revisions of "Mass Extinction"
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===Meaning=== | ===Meaning=== | ||
A '''mass extinction''' is when a large number of [[species]] in a [[community]] become [[extinct]] at the same time. | A '''mass extinction''' is when a large number of [[species]] in a [[community]] become [[extinct]] at the same time. | ||
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| + | ==Key Stage 4== | ||
| + | ===Meaning=== | ||
| + | A '''mass extinction''' is when a large number of [[species]] in a [[community]] become [[extinct]] at the same time. | ||
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| + | ===About Mass Extinctions=== | ||
| + | Since life began on [[Earth]] there have been 5 great [[Mass Extinction|mass extinctions]]: | ||
| + | *Ordovician–Silurian Extinction - 439 million years ago 86% of life on [[Earth]] was made '''extinct''' by the climate rapidly cooling. | ||
| + | *Devonian Extinction - 364 million years ago 75% of life on [[Earth]] was made '''extinct''' too many [[nutrient]]s washed into the oceans causing [[eutrophication]] killing sea life. | ||
| + | *Permian–Triassic extinction - 251 million years ago 96% of life on [[Earth]] was made '''extinct''' when [[Volcano|volcanic]] eruptions ignited coal deposits poisoning the atmosphere. | ||
| + | *Triassic–Jurassic extinction - Between 199 to 214 million years ago many species became '''extinct''' due to a number of events including climate change. This [[extinction]] led to the dominance of dinosaurs. | ||
| + | *Cretaceous–Paleogene extinction - 66 million years ago 76% of life on [[Earth]] was made '''extinct''' due to an [[asteroid]] impact on [[Earth]]. This [[extinction]] led to the end of dinosaurs and the dominance of [[mammal]]s. | ||
| + | * ... Some scientists believe we are in the middle of another [[Mass Extinction|mass extinction]] caused by [[human]]s because around 200 [[species]] are going '''extinct''' every day. | ||
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| + | ==Extra Information== | ||
| + | {{#ev:youtube|https://www.youtube.com/watch?v=RAdNCIIYXvo}} | ||
Revision as of 09:06, 20 April 2019
Contents
Key Stage 3
Meaning
A mass extinction is when a large number of species in a community become extinct at the same time.
Key Stage 4
Meaning
A mass extinction is when a large number of species in a community become extinct at the same time.
About Mass Extinctions
Since life began on Earth there have been 5 great mass extinctions:
- Ordovician–Silurian Extinction - 439 million years ago 86% of life on Earth was made extinct by the climate rapidly cooling.
- Devonian Extinction - 364 million years ago 75% of life on Earth was made extinct too many nutrients washed into the oceans causing eutrophication killing sea life.
- Permian–Triassic extinction - 251 million years ago 96% of life on Earth was made extinct when volcanic eruptions ignited coal deposits poisoning the atmosphere.
- Triassic–Jurassic extinction - Between 199 to 214 million years ago many species became extinct due to a number of events including climate change. This extinction led to the dominance of dinosaurs.
- Cretaceous–Paleogene extinction - 66 million years ago 76% of life on Earth was made extinct due to an asteroid impact on Earth. This extinction led to the end of dinosaurs and the dominance of mammals.
- ... Some scientists believe we are in the middle of another mass extinction caused by humans because around 200 species are going extinct every day.