Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
30 Cards in this Set
- Front
- Back
|
The large volcanoes of the Cascade Range are what type of volcano?
|
Stratovolcano
|
|
|
What is the typical composition of lava in the Cascade volcanoes?
|
Andesite
|
|
|
Crater Lake is all that remains of a stratovolcano that is called:
|
Mount Mazama
|
|
|
The Cascade volcanoes are part of a chain of circum-Pacific volcanoes called:
|
Ring of Fire
|
|
|
The Cascade Range is located adjacent to what type of plate boundary?
|
Convergent |
|
|
What is the name of the plate that is being subducted beneath the North American plate off the northwest coast that is giving rise to the volcanoes of the Cascade Range?
|
Juan de Fuca
|
|
|
Mt. Mazama was destroyed in a catastrophic eruption about how many years ago?
|
7,000 |
|
|
Which one of the following would be the most viscous?
- Felsic rhyolite - Intermediate andesite - Mafic basalt - Ultramafic peridotite |
Felsic Rhyolite the more felsic the lava is, the more thick and sticky or viscous it is |
|
|
The volcanic rocks of the Cascades are primarily:
|
Extrusive and intermediate in silica |
|
|
Chemical zonation in the magma chamber led to the lighter elements rising to the top and the denser elements sinking to the bottom. This resulted in which one of the following?
|
Dark volcanic debris is on top of light volcanic debris at the surface |
|
|
The activity associated with the stratovolcanoes of the Cascades is generally considered:
|
Violent and characterized by lava of intermediate viscosity |
|
|
Crater Lake occupies a very large collapse feature called a:
|
Caldera |
|
|
What kind of a feature is Wizard Island?
|
Cinder cone |
|
|
The water in Crater Lake comes from:
|
Rain and snowmelt
|
|
|
What name is given to a light frothy volcanic rock that is so full of air holes resulting from escaping gases in the lava that it may float?
|
Pumice
|
|
|
Which volcano might very well be the most dangerous volcano in the Cascades?
|
Mount Rainier
|
|
|
An intrusive body of igneous rock is called:
|
A pluton |
|
|
Hot volcanic debris mixed with gases that rushes nearly frictionless down the slopes of a volcano at speeds up to 125 miles per hour is called a:
|
glowing avalanche
|
|
|
If you find ash from Mt. Mazama, you know that:
|
The rock layer beneath the ash is older than 7,000 years |
|
|
T/F All of the Cascade Range volcanoes are extinct.
|
False |
|
|
T/F Tsunami could be generated by earthquakes in the Cascades. |
True |
|
|
T/F There have never been glaciers in the Cascades. |
False |
|
|
T/F The deeper you go into the Earth, the cooler it gets.
|
False |
|
|
T/F About 80% of the worlds volcanoes are located in the circum-Pacific region.
|
True |
|
|
a chain of volcanoes that circles the pacific ocean, includes Japan, Aleutian islands, Tonga, the Andes, and the cascade range in western north America
|
Ring of Fire |
|
|
What % of the worlds volcanoes are located in the Ring of Fire? |
80% |
|
|
The volcanoes of the Cascades are characterized by what type of lava? |
Andesitic |
|
|
Glowing avalanche material that fuses together is called |
Welded tuff |
|
|
what feature results from tuff deposits, steam vents released gasses into tuff cementing them together and making it more resistant to erosion
|
Pinnacles |
|
|
What feature results from intrusive magma squeezes into cracks and fractures and solidifies without reaching surface |
dikes |
