A passage allowing the flow of volcanic magma
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Category: <span>C</span>
The successive chain of mountainous ranges on the western coast of North and South America
A large fracture zone consisting of a series of parallel veins
A reddish metal, symbol, Cu
An ore containing more than one mineral of economic value
Blast patterns or sequences used to influence the path of the blast
Shares in a company with voting right but no fixed or assured dividend other than the performance of the stock price
A gradual decrease between geologic horizons
An ore of niobium, FeNb2O6
An line on a map or chart used to depict topography and surface