The type of mountain that forms when molten rock erupts from a hole in the earth's crust is a(n) _______________ mountain.

The scale used to measure the damage an earthquake does is the __?___ scale.

Lava that hardens to form a smooth surface or a ropy surface is know as

consist fine pyroclast that are light enough to be carried by the wind.

The earth's outer layer made of solid rock is the __?__.

The earthquake zone stretching from southern Europe to Indonesia is the ___?

What is the point on the earth's surface directly above where an earthquake begins?

What is the channel in a volcano through which gasses, ash, and molten rock are ejected from the earth's interior?

consists primarly of erupted volcanic ash and rock fragments held loosly together.

What are large pieces of ejecta formed when lava solidifies after being thrown high into the air?

volcano that is inactive but can erupt again

What is the most abundant element in the earth's crust?

The study of earthquakes is called _______________.

Which of the following is most likely to cause a volcanic eruption to be violent?

An instrument used to record the vibrations caused by an earthquake is a(n) ___________.

volcano that will probably not erupt again.

About 80% of the world's earthquakes occur in the ___?

The scale that is considered the most reliable method for measuring the energy released by an earthquake is the ___?___ scale.

The central portion of the earth is the ?