Exam 22: Minerals, Rocks, and Volcanoes

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

Dripstone formations that form on cavern ceilings are called _____________.

The chemical alteration of preexisting rocks by chemically reactive, hot-water solutions is called ______________ metamorphism.

The scientist ______________ is generally regarded as "the father of geology."

The most common rocks in Earth's crust are

The most violent volcanic eruption in recorded history was that of

Which of the following is not one of the types into which rocks are classified?

Volcanoes that explode violently tend to have magmas of

A cohesive aggregate of one or more minerals is called a

Which of the following is ranked 7 on the Mohs scale?

The term ______________ refers to the way in which a mineral breaks into splinters, irregularly shaped pieces, or shell-shaped surfaces.

The color of a mineral's powder is called its ______________.

The color of the powder of a mineral is known as the mineral's

The term ______________ refers to the tendency of some mineral to break along flat planes at definite angles.

Which igneous rock has dark color (low silica content) and small grains (fine texture)?

Silicates are minerals that have the oxygen and silicon ______________ as their basic structure.

Another name applied to the grain size in a rock is

Magma viscosity depends on the silica content and the ______________ of the magma.

Crater Lake, atop Mount Mazama in Oregon, occupies a volcanic

The size and shape assumed by the crystal faces when a mineral crystal has time and space to grow are known as the mineral's ______________.