Show:
The Basics of Earthquakes
Structure of a Volcano
Eruptions & Lava
Additional Volcano Information
100
Elastic Rebound Theory
What theory explains how energy is stored in rocks?
100
Magma chamber
What is the pocket of magma that all volcanoes have?
100
Aa & Pahoehoe.
What are the two types of lave produced by quiet eruptions?
100
lava
Magma that reaches Earth's surface is called ________.
200
Focus
What is the point within the Earth where faulting begins?
200
Pipe
What is the long tube that connects the magma chamber to the earth's surface?
200
Pyroclastic flow
__________ is when an explosive eruption hurls out ash, cinder, bombs, and gases.
200
belts
Volcanoes occur in _______ that extend across continents or oceans.
300
Convergent
Most earthquakes occur from __________ activity.
300
Vent
Molten rock and gas leave volcanoes through __________.
300
active
An __________ volcano is still erupting or has shown signs of erupting in the near future.
300
divergent
Most occur at ________ plate boundaries.
400
Isoseismal
_________ lines identify areas of equal intensity.
400
Crater
What is the bowl-shaped area that may form at the top of the volcano around the central vent?
400
extinct
If a volcano is _______, it is unlikely to erupt again.
400
600
There are ________ active volcanoes worldwide.
500
Benioff
Focal depth increases along a dipping seismic zone called a ________ zone.
500
A dike goes across rock layers. Sill goes between rock layers.
What is the difference between a dike and a sill?
500
silica content
The greater the _________ of magma, the thicker it is.
500
hotspot
__________ volcanoes are a result of where magma from within the mantle melts through the crust.