Devonian Period – fish, lungfish
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 [...]
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06, 2017
24
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
Carboniferous Period – Geology
Dragonfly When was the Carboniferous period? With the end of the Devonian period about 359 million years ago, the Carboniferous period got started. More about the Devonian Quick summary of [...]
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06, 2017
What happened in the Cambrian Period?
Mossy rocks The Cambrian gets started At the beginning of the Cambrian Period, about 542 million years ago, there were sea creatures like hydras, jellyfish, sponges and seaweed living in [...]
23
06, 2017
What happened in the Archaean Eon?
Archaean Eon: A volcano erupts out of the water The beginning of the Archaean Eon After the end of the Hadean Eon is the beginning of the Archaean Eon. That's about [...]
23
06, 2017
Earthquakes, tsunamis, and the Richter scale
Earthquake in Peru - Earthquakes can split the ground open! What causes earthquakes? What causes earthquakes? Earthquakes happen when the moving tectonic plates that make up the surface of the Earth [...]
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06, 2017
Clay, sand, and loam – Soil types
Soil types triangle What is dirt made of? All dirt is basically made of three different kinds of particles, as Aristotle and his student Theophrastus saw in the 300s BC. [...]
25
05, 2017
What is marble? History of Art
What is marble? A Cycladic figurine from Ancient Greece in marble, once realistically painted. What is marble made out of? Marble is metamorphic limestone . That is, marble is a metamorphic rock [...]
25
05, 2017
What is limestone? History of Art
A block of limestone Starting with seashells Limestone is a kind of sedimentary stone that is very common all over the world. This kind of stone forms out of the shells of [...]
25
05, 2017
What is travertine? History of Architecture
Is travertine marble? No. The travertine is the white stone in between the bricks (This is from the Colosseum in Rome) Is travertine marble? Travertine is a kind of sedimentary [...]
