travertine

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Calcium – Atoms and Chemistry

By |2019-02-26T05:37:02-07:00June 1st, 2017|Biology, Chemistry|

Chalk cliff (made of calcium atoms) in Cottonwood Canyon, Pueblo, Colorado What is calcium? When a star is on the way to converting all of its carbon and oxygen atoms into iron, calcium is one kind of atom it makes along the way. More about stars And about atoms All our chemistry articles What's [...]

What is marble? History of Art

By |2018-06-15T16:15:43-07:00May 25th, 2017|Architecture, Art, Geology|

What is marble? A Cycladic figurine from Ancient Greece in marble What is marble made out of? Marble is metamorphic limestone . That is, marble is a metamorphic rock made out of limestone. (More about metamorphic rocks) And then limestone is a rock made from the shells of billions of tiny sea creatures that died [...]

What is limestone? History of Art

By |2018-04-15T11:31:53-07:00May 25th, 2017|Architecture, Art, Geology|

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 zillions of little tiny sea snails and creatures like that. These snails and stuff lived in the sea, billions of years ago. When [...]