article_snippet.sent: The Great Dying, which struck the Earth 252 million years ago, wiped out more than 96 per cent of the world's creatures.
article_snippet.sent: The Great Dying, which struck the Earth 252 million years agothe Earth , wiped out more than 96% of the world's creatures.
article_snippet.sent: The Great Dying, also known as the Permian-Triassic Boundary extinction, took place over a 60,000-year period, and acidification of the oceans lasted for around 10,000 years.
article_snippet.sent: The Great Dying, also known as the Permian-Triassic Boundary extinction, took place 252 million years ago.
article_snippet.sent: Ordovician-Silurian mass extinction - 443.4 million years ago .
article_snippet.sent: Ordovician-Silurian mass extinction - 443.4 million years ago was the third largest extinction in Earth's history, and had two peaks of dying separated by hundreds of thousands of years.
article_snippet.sent: Late Devonian mass extinction - 375-359 million years ago .
article_snippet.sent: Three quarters of all species on Earth died out in the Late Devonian mass extinction, although Three quarters of all species on Earth may have been a series of extinctions over several million years.
article_snippet.sent: Permian mass extinction - 252 million years ago .
article_snippet.sent: Permian mass extinction - 252 million years ago has been nicknamed The Great Dying, since an incredible 96 per cent of species died out.
article_snippet.sent: Triassic-Jurassic mass extinction - 201 million years ago .
article_snippet.sent: Cretaceous-Tertiary mass extinction - 66 million years ago .