Exam 22: Minerals, Rocks, and Volcanoes

Dikes are examples of ______________ plutons.

The sedimentary rock known as ______________ consists of angular pebbles cemented together by silica, calcium carbonate, or iron oxide.

Igneous rocks are classified according to their silica content, or color, and their ______________.

Rocks are classified into three types on the basis of their

Rocks solidified from molten material below ground are classified as ______________ igneous rocks.

Marble and gneiss are classified as ______________ rocks.

A set of ten minerals used as reference standards in determining hardness is called the______________ hardness scale.

The ratio of a mineral sample's weight to the weight of an equal volume of water is called the mineral's ______________.

Gas, lava, and pyroclastics are the three general products emitted during a(n) ______________.

A mineral that looks glassy is said to have a(n) ______________ luster.

Sediments that are composed of solid fragments derived from preexisting rocks are called ______________ sediments.

Conglomerate and breccia are classified as ______________ rocks.

The saying "The present is the key to the past" is a simple way to state the basic geologic concept called ______________.

The term hardness refers to the ability of a mineral to

The most abundant rocks in Earth's crust are the

Gabbro and rhyolite are classified as ______________rocks.

The two principal agents of metamorphism are pressure and ______________.

That each successive layer of sediments is deposited on top of the previous layer, and hence is younger than the lower layer, is a statement of the

Molten rock material on Earth's surface is known as ______________.

An example of igneous rock is