Test 2 Flashcards
Which of the following is most likely to be found the greatest distance from the side of the eruption
Basaltic lava
What do as and pahoehoe lavas have in common?
Both come from low-silica basaltic magmas
What region on earth has the largest concentration of composite volcanoes?
The pacific margin
Why do magma‘s rise towards earths surface?
Magma is less dense because it is hotter than solid rock of the same composition
Why do volcanoes like Mount Saint Helens irrupt explosively, whereas others like Kilauea are relatively quiescent?
The magma is associated with Mount Saint Helens or more viscous than those associated with Kilauea because they have more silica
Which of the following would be most helpful in determining where it would be safest to live near a possible active stratovolcano?
The ages, thickness, and distribution of welded tough, lahars, and Pyroclastic deposits around the volcano 
An increase in sulfur dioxide emissions is a sign that
A major eruption may occur within the next few days to years
The difference between soil and regolith is?
Soil is the layer of Material that includes a mixture of rock fragments in organic matter, well regolith is the layer of rock fragments
Soil is considered to be an interface between spears because:
It contains water, air, rock, and organic matter
The ideal place to develop a good soil is:
On gently varying topography
By definition, the blank is composed of “Partly alter the parent material”
C - horizon
Where would you expect to get the thinnest o layer in a soil profile?
In a desert
In terrain where a steep hill slopes, which crop and cultivation technique will minimize soil erosion?
Apples; land between the trees is planted in grass and not cultivated
The major types of stress are:
Sheer, tension, and compression
Which of the following make it more likely that a Rockwell bend instead of breaking?
High confining pressure, high temperature, weak chemical bonds
Reverse faults are associated with:
Compressional stresses that characterize convergent boundaries
The relationship between stress and strain is:
The strain is the result of stress
How is brittle deformation different from ductile deformation?
Brittle deformation produces joints and faults, well ductile deformation produces folds.
The Black Hills of South Dakota or a large storm that has been deeply eroded. Where would you find the youngest exposed rocks associated with the dome?
Along the outside edges of the dome
For the fault indicated in the figure below, which side is the hanging wall?
A is the hanging wall
Which type of fault is shown in the figure below?
Normal fault
For the fault shown in the figure below, how is the region changed or deformed?
It gets longer
If I drawl a line connecting to nearby points of equal elevation on an indicated there, the orientation of that line would be called the blank direction
Strike
Over the oceans, evaporation exceeds precipitation, so why doesn’t the sea level go down?
Because the runoff from continents is about the same as the lost evaporation
