What’s the sun made of? – Astronomy – Science
The sun from space The Sun is a star, just like billions of other stars in the universe. Our Sun probably formed a little more than four and a half billion years [...]
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08, 2017
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08, 2017
Meteors – Shooting stars – Astronomy
Lyrid meteor shower What is a meteor? Meteors or meteorites are bits of rock (like granite) and ice - usually a mixture of rock and iron and nickel but sometimes just rock or [...]
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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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06, 2017
What happened in the Cretaceous Period?
Volcano erupting When was the Cretaceous period? During the Cretaceous period, beginning about 145 million years ago, the continents continued to drift away from each other. Plate tectonics Back to [...]
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06, 2017
Why are chestnuts a famine food?
A pile of chestnuts When did chestnuts evolve? Chestnut trees are related to oak trees, and like oak trees they probably evolved early, around 66 million years ago, around the [...]
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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 [...]
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05, 2017
What are Chordates? (Animals with spinal cords)
Chordates include this giraffe from Kenya What is a chordate? Any animal that has a spinal cord is a chordate. This group covers most of the creatures you see at [...]
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05, 2017
History of Birds – Biology
A robin sits on a branch: birds biology When did birds evolve? The first birds evolved out of earlier small dinosaurs late in the Jurassic period, about 150 million years [...]
