Earth's Atmosphere
Mineral: a solid material of Earth´s crust with a definite composition.
Luster: the way light bounces off mineral´s surface.
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Streak: the color of the powder left when a mineral is rubbed against a hard,rough surface.
Hardness: how well a mineral resists scratching.
Cleavage: the tendency of a mineral to break along flat surfaces.
Ore:a mineral containing a usefull substance.
Gem:mineral valued for being rare and beautiful.
Nonrenewable resource: a resource that cannot be replaced within a short period of time or at all.
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