The following are the largest volcanoes in the world.
 the volcanoes in the Cascade Mountains.
 *the Hawaiian volcanoes.
 the volcanoes in the Aleutian Islands.
 the volcanoes in the Andes Mountains.
 the Italian volcanoes.

When mafic magma breaks through continental crust extensive faults or fracture systems, the following often results:
 shield volcanoes.
 *lava plateaus.
 composite volcanoes.
 lava domes.
 pyroclasitic sheets.

Wizard Island in Crater Lake, Oregon, is an example of a 
 *cinder cone.
  volcanic neck.
  lava dome.
  composite volcano.
  none of the above.

The volcanism associated with what is now Yellowstone National Park could best be described as
 a shield volcano.
 a lava plateau.
 *a pyroclastic sheet.
 a spreading-ridge pillow basalt.
 a rift-valley basalt flow. 

Referring to the topographic profile of the volcanic feature depicted in Figure 5.1, page 86, Lab Manual, measure with your protractor the slope angle at the surface designated X.  The slope angle at X is
 just under 1 degree.
 just under 5 degrees.
 *just under 30 degrees.
 just under 45 degrees.
 just under 60 degrees.

Measure with your protractor on the same topographic profile ( Fig. 5.1)  the slope angle at the designated Y. The slope angle of Y is
 just under 1 degrees.
 *just under 5 degrees.
 just under 30 degrees.
 just under 45 degrees.
 just under 60 degrees.

Based upon the slope angles just measured and the provided scale, the volcanic feature depicted in Figure 5.1 is
 a volcanic neck.
 a lava dome.
 a cinder cone.
 *a composite volcano.
 a shield volcano.

Magma that was 9,000meters below the surface at noon and 6,000 meters below the surface at 4 P.M. is ascending at a rate of 
 *750 meters/hour.
 800 meters/hour.
 850 meters/hour.
 900 meters/hour.
 950 meters/hour.

Assuming that the previously-determined rate of ascent continues, when will the magma reach the surface?
 8 P.M.
 9P.M.
 10 P.M.
 11 P.M.
 *midnight

<i>The following questions are based on the video field trip "Mount Saint Helens."</i>
The volcanism at Mount Saint Helens is the result of
 transform displacement beneath the Cascade Mountains.
 divergent upwelling beneath the Cascade Mountains.
 *subduction beneath the Cascade Mountains.
 a hot spot or mantle plume.
 intense radioactivity in the bedrock beneath the Cascade Mountains.

Mount Saint Helens blew away almost
 25 million cubic feet of its summit.
 *a cubic mile of its summit.
 3 cubic mile of its summit.
 5 cubic mile of its summit.
 8 cubic mile of its summit.

The volcanic landslide at Mount Saint Helens descended the north face of the volcano at a velocity of
 50 mph.
 100 mph.
 *250 mph.
 350 mph.
 500 mph.

During the initial eruption, magma spilled from Mount Saint Helens as
 a highly fluid lava.
 a highlt viscous lava.
 a mixture of highly fluid and highly viscous lava.
 *a mixture of super hot fragments of pumice and ash.
 a mixture of super hot fragments of basalt and gabbro.

The volcanic blast at Mount Saint Helens blew down millions of trees in a
 50 square mile area.
 100 square mile area.
 *150 square mile area.
 250 square mile area.
 350 square mile area.

A hot, steaming tongue of mud and debris slid down the North fork of the Toutle River at a velocity fo about
 10 mph.
 18 mph.
 *30 mph.
 55 mph.
 82 mph.

The total damage and cleanup costs for the Mount Saint Helens eruption exceeded
 $1 billion.
 *$3 billion.
 $5 billion.
 $8 billion.
 $12 billion.

After the eruptionof Mount Saint Helens, the stream channels in the area might be described as 
 *braided.
 meandering.
 bordered with natural levees.
 V-shaped in cross section.
 U-shaped in cross section.

The human toll for the Mount Saint Helens eruption was 
 32 dead and 10 missing.
 *about 63 dead and 20 missing.
 104 dead and 30 missing.
 216 dead and 60 missing.
 408 dead and 100 missing.

The highest surface temperatures in the devastated area during the Mount Saint Helens eruption were estimated to be 
 200(F.
 350(F.
 500(F.
 *about 650(F.
 800(F.

The pH of the volcanic ash from Mount Saint Helens was found to be
 alkaline.
 slightly alkaline to neutral.
 neutral.
 *slightly acid to neutral.
 acid.

The lava dome in the crater of Mount Saint Helens grew to a height of
 200 feet.
 300 feet.
 400 feet.
 500 feet.
 *600 feet.

The gasses emitted by Mount Saint Helens are monitored continuously since the relative levels of 
 hydrogen sulfide and carbon dioxide may bear a relationship to eruptions.
 free chlorine gas and carbon dioxide may bear a relationship to eruptions.
 *sulfur dioxide and carbon dioxide may bear a relationship to eruptions.
 free hydrogen gas and carbon dioxide may bear a relationship to eruptions.
 free nitrogen gas and carbon dioxide may bear a relationship to eruptions.

The colorful sublimates deposited upon the volcanic rocks near the lava dome by gaseous emissions include
 *sulfur, iron oxide and manganese.
 banded agate and precious opal.
 zinc sulfide, lead sulfide and magnesium
 azurite and malachite.
 iron sulfide, calcium sulfide and copper.

Geologists bounce lasers off the surface of Mount Saint Helens to measure
 the seismicity of Mount Saint Helens.
 changes in magnetism caused by Mount Saint Helens.
 changes in the density of Mount Saint Helens.
 *changes in the position of the surface of Mount Saint Helens.
 changes in the temperature of Mount Saint Helens.

During reforestation efforts in the devastated area around Mount Saint Helens, tree seedlings must be rooted in the soil because the overlying ash and pumice
 contain no potassium.
 contain no phosphorous.
 contain no potassium or phosphorous.
 *contain no nitrogen.
 contain no potassium, phosphorous or nitrogen.