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Calcium – Atoms and Chemistry

By |2018-04-16T14:37:53+00:00June 1st, 2017|Biology, Chemistry|

Chalk cliff (made of calcium) in Cottonwood Canyon, Pueblo, Colorado 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. One atom of calcium has 20 protons and 20 electrons (and 20 neutrons). Calcium is a [...]

What is marble? History of Art

By |2018-06-15T16:15:43+00:00May 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+00:00May 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 [...]