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What is plate tectonics? Earthquakes and volcanoes

By |2018-04-18T09:54:07-07:00September 21st, 2017|Geology|

The world as seen from space (flattened out) When you look at a map of the world, it seems as though it was always like that - North America on top of South America, Europe north of Africa, Australia off at the bottom right. But really all of the dry land on Earth moves around like floating shapes about 60 miles [...]

Where are the Appalachian mountains?

By |2019-01-29T05:37:18-07:00June 25th, 2017|Geology, North America|

The Appalachian Mountains When did the Appalachian Mountains form? About 300 million years ago, near the end of the Carboniferous period, when the first reptiles were evolving, the tectonic plates began to form the supercontinent of Pangaea. More about plate tectonics The Carboniferous period All our geology articles How high were the Appalachians [...]

Ordovician Period – limestone and liverwort

By |2018-04-21T11:56:38-07:00June 24th, 2017|Geology|

The Ordovician period saw the evolution of the octopus At the end of the Cambrian period, about 488 million years ago, most of the plants and animals living on Earth died, because of some catastrophe that we don't know much about. This catastrophe marks the beginning of the Ordovician period. Limestone formed Sea [...]

Devonian Period – Gondwana, ferns, lungfish

By |2019-05-07T05:56:55-07:00June 24th, 2017|Biology, Geology|

Coelocanth: a fish from the Devonian period When was the Devonian period? Four hundred and sixteen million years ago, when the Silurian period ended and the Devonian period began, most of the land on Earth was clumped together into a supercontinent called Gondwana. Silurian period Plate tectonics All our geology articles Life in [...]