sedimentary

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What is flint good for? Stone tools

By |2019-06-10T20:10:16-07:00September 5th, 2017|Africa, Prehistory, Science|

What is flint? Flint is a sedimentary rock made out of an igneous rock. What is flint made of? It's pretty complicated. Billions of years ago, silicon and oxygen atoms shot out of a star when it went supernova. What is a supernova? All our geology articles About four billion years ago, some [...]

Earthquakes and algae – the planet Earth

By |2019-05-22T14:05:38-07:00August 18th, 2017|Physics|

Molten lava: the beginnings of planet Earth What is the Earth made of? Most of the molecules that smashed together to make the Earth were iron. The smashing together released a lot of heat, so the whole center of the planet Earth is made of hot melted iron. How old is the Earth? What is [...]

Ibn Sina (Avicenna) – Medieval Islamic medicine – Islamic Empire

By |2019-04-24T06:03:09-07:00July 27th, 2017|Islam, Science|

Where Ibn Sina came from: Uzbekistan Ibn Sina and the Samanids in Uzbekistan Ibn Sina (known to Europeans as Avicenna) was a scientist. He was born about 980 AD in the north-eastern part of the Abbasid Empire. That was in the kingdom of the Samanids. (It's modern Uzbekistan.) Who were the Samanids? Medieval Islamic science All our medieval Islam [...]

What are sedimentary rocks? Shale and limestone

By |2018-10-03T09:50:54-07:00June 26th, 2017|Geology, History|

Sedimentary rocks: Limestone cliffs in Saudi Arabia Before sedimentary rocks When the Earth was first forming, about six billion years ago, there weren't any sedimentary or metamorphic rocks. The only rocks were igneous rocks like quartz. These formed when melted silica, carbon, and other molecules cooled off and stuck together. More about igneous rocks [...]