dinosaurs

/Tag: dinosaurs

What’s the sun made of? – Astronomy – Science

By |2018-04-24T14:46:25-07:00August 19th, 2017|Physics|

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 ago, just a little bit before the planets formed around it. It's not one of the older stars in the Universe. Probably some of [...]

Meteors – Shooting stars – Astronomy

By |2018-05-31T11:49:25-07:00August 18th, 2017|History|

Lyrid meteor shower 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 just iron - from out in space that get sucked into the gravity of the Earth and fall through our atmosphere to the ground. Usually this is because a comet has passed close enough to the Earth for [...]

Jurassic Period – dinosaurs and ferns

By |2018-04-21T11:56:46-07:00June 24th, 2017|Geology, When|

A dinosaur skeleton When the Jurassic period began, about 199 million years ago, a lot of animals had just become extinct in the catastrophe that ended the Triassic period. This left room for the dinosaurs to have a lot of baby dinosaurs. Soon all different kinds of dinosaurs were living all over the [...]

What happened in the Cretaceous Period?

By |2019-04-29T06:34:15-07:00June 24th, 2017|Geology|

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 the Jurassic Summary of geological eras All our geology articles What happened during the Cretaceous? Because the continents were separated, mammals, birds, and [...]

Why are chestnuts a famine food?

By |2019-03-22T21:41:11-07:00June 21st, 2017|Food|

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 end of the Cretaceous period, just before the dinosaurs died off. The Cretaceous period Evolution of trees More about dinosaurs Where do chestnut trees grow? Wild [...]

What are reptiles? Biology and Evolution

By |2018-04-21T11:56:35-07:00May 26th, 2017|Biology|

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 one big continent called Pangaea. All the land being together changed the weather so that it was drier and colder than before. That [...]

What are dinosaurs? Evolution and Biology

By |2019-05-08T08:46:44-07:00May 26th, 2017|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 mass called Pangaea. Earlier chordates More about reptiles The Triassic period All our biology articles Cold-blooded or warm-blooded? Dinosaur eggs: evolution of [...]

What are Mammals – Biology

By |2018-04-21T11:56:43-07:00May 26th, 2017|Biology|

Rat from New Zealand About 200 million years ago, when all the land on Earth was stuck together in one big continent called Pangaea, some animals related to reptiles living on Pangaea gradually evolved into a new group called mammals (MAMM-elz). The mammals were different from the earlier reptiles in several ways. First, [...]