Chapter 5 Lessons 3 and 4 Flashcards
What is a volcano?
An opening in the Earth’s crust
What is lava?
When magma reaches the Earth’s surface
What is magma?
When rock is melted under the Earth’s surface
What is a hot spot?
An unmoving pool of magma below the Earth’s crust.
What is an eruption?
An outpouring of melted rock, ash, gases, or a combination of all three.
What is an island chain?
A line of volcanic mountains.
What is the Ring of Fire? Where is it located?
Volcanoes that occur on the Pacific Ocean plate boundary
When does a volcano erupt?
At plates where one plate moves under another
What is a caldera?
A giant impression that forms when a volcano collapses.
Name three types of volcanoes
Active, Dormant, Extinct
What is an active volcano?
One that is currently erupting (or recently erupted)
What is a dormant volcano?
One that hasn’t erupted for a long period of time
What is an extinct volcano?
One that has stopped erupting or is “dead”
What is an earthquake?
A sudden movement in the Earth’s crust
What is magnitude?
Measure of energy released by an earthquake.
