GeoJeopardy! Fridays #41

Time for GeoJeopardy! Fridays, just because.

- Know Your Earth -

Giovanni Arduino classified rocks oldest to newest as primary, secondary & this, a term still used


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Temperatures range from about 2,000 to 8,000 degrees Fahrenheit in this part of the Earth between the crust & the core

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Essential minerals can give rocks their names: ferromagnesian minerals contain this &/or magnesium

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Change 2 letters in magnetism & you get this term for the formation of igneous rocks in the Earth's crust


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Named for the tiny time period that followed it, this interval covers 80% of geological time

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All the answers as well as any other previous GeoJeopardy! questions can be found over at my website by clicking the link.  

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Questions, images, and videos courtesy of j-archive.com