Vocabulary#13

1.Mineral: a solid material of Earth's crust with a definite composition.

2.Luster: the way light bounces off a mineral's surface.

3.Streak: the color of the powder left when a mineral is rubbed against a hard, rough surface.

4.Hardness: how well a mineral resist scratching.

 

5.Cleavage: the tendency of a mineral to break along flat surfaces.

6.Ore: a mineral containing a useful substance.

7.Gem: a mineral valued for being rare and beautiful.

8.Nonrenewable resource: a resource that cannot be replaced within a short period of time or at all.