What is plate tectonics? Earthquakes and volcanoes
Plate tectonics: The world as seen from space (flattened out) The continents move around When you look at a map of the world, it seems as though it was always [...]
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09, 2017
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06, 2017
Where are the Ural Mountains?
Ural Mountains in Russia Ural Mountains in Central Asia The Ural Mountains run from north to south through Central Asia. They separate Europe from Asia. Like the Appalachian Mountains, the [...]
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06, 2017
Triassic period – pine trees and pterodactyls
A turtle in the desert During the Triassic period (about 248 to 199 million years ago), most of Earth's land continued to stick together in one big supercontinent, Pangaea. Because [...]
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06, 2017
Permian period – Reptiles and pine trees
Crocodiles About 290 million years ago, the Carboniferous period ended and the Permian period began. Almost all of the land on Earth grouped together in one big supercontinent we call [...]
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06, 2017
Jurassic Period – dinosaurs and ferns
A dinosaur skeleton from the Jurassic period How the Jurassic period began When the Jurassic period began, about 199 million years ago, a lot of animals had just become extinct [...]
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05, 2017
What are conifers? Pine trees, gymnosperms
Pine trees - A Spruce tree is a type of gymnosperm and conifer Too dry for ferns and moss Near the end of the Carboniferous period, about 300 million years [...]
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05, 2017
What are turtles? Biology and Evolution
Evolution of turtles: Seychelles tortoise (Jardin des Plantes, Paris) Evolution of turtles The first turtles began to evolve from earlier reptiles about 225 million years ago, during the Triassic period. [...]
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05, 2017
What are reptiles? Biology and Evolution
Boa Constrictor snake Some kinds of amphibians evolved into reptiles about 300 million years ago. At this time, plate tectonics had moved more and more of the land on Earth into [...]
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05, 2017
What are dinosaurs? Evolution and Biology
A dinosaur skeleton: evolution of dinosaurs When did dinosaurs evolve? The first dinosaurs evolved out of earlier types of chordate reptiles about 230 million years ago, on the big land [...]
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05, 2017
Evolution of Mammals – Biology
Rat from New Zealand - Evolution of mammals When did the first mammals evolve? About 200 million years ago, when all the land on Earth was stuck together in one [...]
