Rocks are naturally occurring solids composed of minerals, and they come in three main types: igneous, sedimentary, and ___________.

The ___________ is a series of processes through which a rock forms, changes from one type to another, is destroyed, and forms again by geological processes.

When magma cools and solidifies, it forms ___________ rocks.

A rock that has been changed by heat and pressure into a new kind of rock is called a ___________ rock.

The hardness of a mineral is measured on the ___________ scale.

The color of a mineral's powder when it is rubbed against a porcelain plate is known as its ___________.

Minerals can form from the cooling of magma or lava, through evaporation of liquids, or by ___________ from mineral-rich water.

The tendency of a mineral to break along flat surfaces is known as ___________.

Sedimentary rocks are often formed by the compaction and cementation of sediments, a process known as ___________.

The appearance or quality of light reflected from the surface of a mineral is called ___________.