limestone

10 09, 2017

Coca leaves – South American medicine

By |2019-04-11T19:59:14-07:00September 10th, 2017|Science, South America|Comments Off on Coca leaves – South American medicine

History of coca leaves: Coca farming in the Andes Mountains When did coca plants evolve? Like potatoes, tomatoes, and tobacco, coca plants grow wild in the Andes Mountains of South America. They probably evolved [...]

26 06, 2017

What are sedimentary rocks? Shale and limestone

By |2018-10-03T09:50:54-07:00June 26th, 2017|Geology, History|Comments Off on What are sedimentary rocks? Shale and limestone

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 [...]

26 06, 2017

What is quartz? Igneous rock

By |2018-09-06T07:27:12-07:00June 26th, 2017|Geology|Comments Off on What is quartz? Igneous rock

What is quartz? A chunk of white quartz What is quartz made of? Quartz is an igneous rock made out of molecules of silicon and oxygen atoms held together in [...]

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