The mine building where workers change into uniforms and safety equipment
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Category: <span>C</span>
A brassy-yellow tetragonal mineral with a metallic blue tarnish or oxide, it is the common ore of copper. CuFeS2
A copper sulphide mineral of secondary enrichment
An geophysical instrument used to measure magnetic strength and shape
A silvery white, soft alkaline rare-earth metal. Symbol, Cs
Strata layers and folds that dip toward a common center
The common ore of the metal chromium
The separation of particles by density by spinning the mix of minerals quickly in a cyclone
A halogen element, Symbol, Cl
The era following the Mesozoic Era, known as the Era of Mammals