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Mesozoic Era Prezi
Transcript of Mesozoic Era Prezi
Cretaceous period During the Triassic period most animal life was extinct, due to the "Great Dying." Those animals that survived repopulated the planet, creating rodent size mammals and the first dinosaurs. At the beginning of the Mesozoic Era there were two continents called Laurasia and Gwandawanaland.
Laurasia and Gwandawanaland eventually joined into one continent called Pangea.
During the Jurassic Period in the Mesozoic Era the continents began to shift into what we now call North America, South America, Asia, Africa, and Europe.
Because of the movement of the continents many of the mountain ranges that we know today were created during the Cretaceous Period. The oxygen level started low due to the "Great Dying," but the levels continued to drop through out the Mesozoic Era.
The low oxygen of the Triassic Period was the lowest ever experienced in earth's history. However, the oxygen levels climbed during the Jurassic and Cretaceous periods to more modern levels.
During the Triassic Period the climate was very dry, but soon changed during the Jurassic Period. Oceans began to rise due to rising layers of magma on the seafloor. The land was soon flooded and as a result the climate changed with more humidity which lasted into the Cretaceous Period.
Temperatures began to cool during the Cretaceous Period, but temperatures began to rise towards the end of the Mesozoic Era. The Mesozoic era came to a suprising halt 65 million years ago because of a mass extinction. At least 70% of all life died.
Two theories have been proven scientifically possible. Some say it was due to a meteorite impact while others say it was caused by climate change or volcanic activity.
Ocean life was hit the hardest as a result of the mass extinction. Many large or warm-blooded land animals also became extinct. Most surviving species were animals that lived in lakes or were small rodents. National Geographic.com
AustralianMuseum.net In the Jurassic period gymnosperms and angiosperms started to evolve.
As angiosperms evolved insects evolved as well due to the supply of pollen. These plants were also a main food source for larger animals and offered shelter to smaller creatures. At the start of the Triassic period 90% of earth's creatures were extinct due to volcanic eruptions, climate change, or a fatal run in with a comet or asteroid. This was called the "Great Dying." The Cretaceous Period was known to be the last portion of "Age of the Dinosaurs," but dinosaurs were still evolving at this time. The Mesozoic Era lasted for 183 million years. It started with the Triassic period 248 million years ago and ended with the Cretaceous period 65 million years ago. The most common plants in the Triassic Period were ginkgoes, ferns, and different types of conifer trees.
For those of you that don't know, ginkgoes are a type of very slow growing trees.
During the Jurassic period seed plants such as cyads evolved rapidly. Also ginkgo species increased, but the balboa is the only existing ginkgo species today. Conifer and pine tree species also evolved.
In the Cretaceous Period angiosperms were the dominent species of plants.
At the end of the Mesozoic Era many of the Plant species died but some plants in our modern world are descendants of plants from back then. The ocean teemed with the mollusks and sea urchins that survived. The first corals also started to appear, though other reef building organisms were already there. Giant reptiles such as ichthyosaurs and plesiosaurs hunted fish and ancient squid. Also phytoplankton, which is in our oceans today, first appeared. Triassic Period Jurassic Period Cretaceous Period Birds, a highly successful group of animals, have evolved the most after the mass extinction. With a species count of over 1,000, birds are extraordinary adaptors. But, their survival like all other living things relies on us. And if we don't learn to take care of the Earth, our world could be heading towards another "Great Dying." Thanks For Watching!