vocabulary # 6

mineral = a solid material of earth 's crust with a denfinite composition .

luster  = the way light bounces off  a mineral 's surface

streak = the color of the powder left when a mineral is rubbed against a a hard , rough surface .

hardness = how well a mineral esists scratching .

cleavage = the tendency of a mineral to break along flat surfaces .

ore  = a mineral containg a useful subtance .

gem  = a mineral valued fo being rare and batiful .

nonenewable resource = a resource that cannot be replaced within a shot  period of time or at all .

Image

mineral

luster

streak

hardness

                                                     

cleavage

ore

gem

nonrenewable resources