five
The breakup of Pangaea occurred during the Mesozoic Era, specifically during the Jurassic and Cretaceous periods. This process led to the formation of the modern continents we know today.
During the Paleozoic era, which lasted from about 541 to 252 million years ago, key events included the Cambrian explosion marking the rapid diversification of multicellular life, the colonization of land by plants and insects during the Ordovician and Silurian periods, the emergence of fish and later tetrapods, and the extensive coal swamps of the Carboniferous period. The era ended with the Permian extinction, the largest mass extinction in Earth's history.
This epoch is known as the Paleogene epoch, which follows the Cretaceous period and precedes the Neogene period. During this time, significant geological and climatic changes occurred, including the extinction of dinosaurs and the rise of mammals.
Earth's magnetic poles have reversed many times in the past due to changes in the Earth's molten outer core. As the molten metal moves, it generates the Earth's magnetic field. Over time, this movement can cause the magnetic field to weaken, flip, and establish a new polarity. The process of pole reversals is a natural part of the Earth's geophysical history.
The evolution of photosynthetic organisms, such as cyanobacteria, led to the buildup of oxygen in Earth's atmosphere through a process called the Great Oxidation Event. This occurred around 2.4 billion years ago, gradually transforming the atmosphere from anaerobic to aerobic.
Which mass extinction? There have been five such events. The first one, the Ordovician-Silurian extinction event occurred before the Devonian. The Late Devonian event occurred during the Devonian. All other mass extinctions occurred after the Devonian.
precambrian era
The Permian was the last period of the Paleozoic Era, spanning 299-351 million years ago. It was a time during which reptiles diversified. It ended with the Permian-Triassic extinction event, the largest mass extinction in Earth's history.
During the Permian period, Earth experienced the formation of the supercontinent Pangaea, extensive glaciation in the southern hemisphere, and the diversification of reptiles. The Permian-Triassic extinction event, the largest mass extinction in Earth's history, occurred at the end of the period, resulting in the loss of around 90% of marine species and 70% of terrestrial species.
The mass extinction of dinosaurs occurred around 66 million years ago during the Cretaceous-Paleogene (K-Pg) boundary.
Mass extinction - More than 50% of the population went extinct in a short period of time.Background extinction - An average rate of extinction occurred during a given time period.
4 billon years i think
hi
Life on Earth is less diverse now than it was during the Phanerozoic Era. The Cambrian Extinction caused a sharp decline in biodiversity.
Yes What Climate changes occurred during the Stone Ages?What Climate changes occurred during the Stone Ages?What Climate changes occurred during the Stone Ages?What Climate changes occurred during the Stone Ages?What Climate changes occurred during the Stone Ages?What Climate changes occurred during the Stone Ages?What Climate changes occurred during the Stone Ages?What Climate changes occurred during the Stone Ages?What Climate changes occurred during the Stone Ages?
I believe in cretaceous eraThe Permian Extinction at the end of the Permian era wiped out over 90% of all life on Earth. It happened around 248 million years ago. We think it was a combination of volcanism, and massive global environmental change. There is some evidence (very little) that a comet or asteroid hurried things along.
During: Lots of screaming. After: Much, much less screaming.