Earthquakes
Earthquakes happen in the Earth's crust due to what?
Stress builds up
Focus
Name the volcanic belt encircling the Pacific Ocean.
Circum-Pacific Belt (Ring of Fire)
When two tectonic plates move towards each other, one subducts beneath another, this is called ________________.
Convergent volcanism
Mount Mazama was _______ feet taller than today's Mount Hood.
1,000
When rocks are pulled apart at divergent boundaries, this is called ____________.
Tension
Force applied to a rock is called __________.
Stress
____________________ eruptions are usually basaltic and less explosive.
Divergent volcanism
Volcanoes are fueled by ______________.
Magma
Name one of the tribes who witnessed the explosion.
Klamath, Modoc, Yahooskin Snake Indians, Cow Creek Umpqua Tribe
Strain on a rock changes it's shape due to the stress, what is another word for this?
Deformation
_______ waves are the fastest seismic wave and are often the least destructive.
P-Waves (Primary Waves)
Name the volcanic belt around Asia and Italy.
Mediterranean Belt (Alpine-Himalayan Belt)
When two tectonic plates move away from each other this is called _______________.
Divergent volcanism
Crater lake is considered a ___________ (bowl-shaped hole).
Caldera
Energy is suddenly released inside the Earth, this energy travels in the form of _______________________.
Seismic waves
These waves can move through solids, liquids, and gases.
P-Waves (Primary Waves)
Magma is a slushy mixture of molten ___________, mineral crystals, and _________.
rock, gases
Volcanoes that occur away from plate boundaries are called ______________.
Hot spots
What is the name of the island in the middle of Crater Lake?
Wizard Island
When rocks slide past each other at transform boundaries, this is called ____________.
Shear
_________ waves are the most destructive, are slow, and always arrive second.
S-Waves (Secondary Waves)
The Ring of Fire contains ___________ of the world's active volcanoes.
~75%
___________________ tends to be more explosive, producing stratovolcanoes and volcanic arcs.
Convergent volcanism
How many years did it take for Mount Mazama to form?
400,000