they traveled across the planet, killed off many megafauna like mammoths, wolly rhinos, sabre-tooths, bunyip, megalania, moa, giant eagle, ground sloth and giant cave bear
Now they are threatening many other animals on this planet due to pollution and cause global climate change
Some of them are not all of them are caused by humans
Asteroids.
Mass extinction is when many animals go extinct within a short period of time caused by the same variables/factors leading to the mass extinction.
We are still not sure what caused the mass extinction of the dinosaurs, though an asteroid impact seems to be the popular theory.Scientists believe we may be heading towards another mass extinction event.
The leading theory for the first mass extinction 65 million years ago is a catastrophic event such as an asteroid impact. This event is believed to have led to environmental changes that caused the extinction of the dinosaurs and many other species.
The extinction of animals is caused by humans killing animals. Extinction of animals may also be caused by pollution or forest fires that are killing off the plants and trees.
a comet impacting the earth
mass extinction
The k-t extinction marks the transition from the cretaceous to the tertiary period in which it is hypothesized that a meteorite struck the Earth and caused a mass extinction.
"It was the Cretaceous-Tertiary or the K-T Extinction." - WrongThe K-T Extinction was the mass extinction that wiped out the dinosaurs, which was more widely believed to be caused by a heavenly body colliding with the Earth.The mass extinction that involved a large period of glaciation was in truth the Ordovician-Silurian Extinction, which was the earliest mass extinction.The extinction is associated with a period of glaciation. First, sea levels dropped as glaciers formed. Later, as the glaciers melted, the sea level rose. The cause of this glaciation remains a mystery. One suggestion is land plants caused it by absorbing large amounts of carbon dioxide from the atmosphere. The drop in carbon dioxide could then have caused global cooling.
The effect of mass extinction is extinction, death of a mass
asteroid