Post Test Topic 4 Vocabulary Flashcard

Front

a structure that forms in earth's crust when molten material reaches Earth's surface

Back

volcano

Front

a molten mixture of rock-forming substances, gases, and water from the mantle

Back

magma

Front

an area where lava frequently erupts at the surface, independent of plate boundary processes

Back

hot spot

Front

Once magma reaches the surface, it is known as

Back

lava

Front

Also called a stratovolcano, this is made up of alternating layers of lava flows and ash falls.

Back

composite volcano

Front

A volcano that is dead or causes very little threat of eruption is known as

Back

extinct

Front

Also known as a sleeping volcano, this volcano poses little threat but could reawaken someday.

Back

dormant

Front

Volcanoes that are the more immediate threat.

Back

active

Front

An earthquake's ________________ is a single number that geologists use to assign to an earthquake based on the earthquake's size.

Back

magnitude

Front

The shaking a trembling that results from plate movement shifts which release a large amount of energy is called a(n)

Back

earthquake