Geology 2
14. which of the numbered features is a lava flow
1
2) Which of the following rock photographs depicts a felsic igneous rock?
A
17) Which of the following sites would most likely have composite volcanoes? A is on an 17) island arc, B is in the Andes, C is near Hawaii, D is along a mid-ocean ridge.
A and B
4.which of the following changes in conditions would represent heating during burial
A to C
3.which letter in this classification table indicates the position of rhyolite
B
30) What type of structure is shown in this figure?
Syncline
1) What does this texture indicate about the formation of this rock?
The magma had abundant dissolved gas.
24) Which of the following statements is NOT true about clastic sedimentary rocks?
To be called a sandstone, quartz must make up more than 95 percent of the grains.
21) If you were designing a rock that resisted weathering, which of the following 21) characteristics would it have?
a quartz rich rock
8. a hot spot is interpreted to have formed from
a rising plume of hot mantle material
12) Which of the following is NOT a major controlling factor on volcanic eruption style?
age of volcano
5. which are important ways that magma can raise through the crust?
all
20) Which of the following processes produce sedimentary clasts?
all of these
12. at what depth do gas bubbles have the most effect on magma
at very shallow levels such as within the volcano
13) What types of rocks would be most common in the volcano shown in this photograph?
basalt mostly formed in lava flows
13. eruptions of scoria cones are commonly associated with
basaltic lava flows and lava fountains
7. Most subduction derived magma never reaches the surface, however what is formed if this type of magma reaches the surface continent?
belts of volcanoes
22. what type of rock is shown
breccia
25) A sandstone containing mostly sand but mixed with rounded pebbles and pieces of 25) shells indicates deposition:
by waves at the beach
10) The igneous rocks shown in this photograph are forming:
columnar joints
16. the most dangerous type of volcano is
composite
18. which of the following enviorments would most likely form limestone
coral reef at C
19. what type of weathering is best expressed in this weathered limestone
dissolution red and brown color
6. which of the following causes magma to be less viscous?
fewer silicate chains in the magma
6) What does the texture of this rock indicate about its cooling history? The magma cooled:
for a while at some depth and then rose to the surface where it finished solidifying
14) When basaltic lava reach the ocean they:
form pillow basalts
5) Which of the following changes in conditions represents the main cause of melting 5) beneath mid-ocean ridges?
from C to B
28) Under what conditions was this rock likely deformed?
hot and deep conditions
18) The deep-sea floor is characterized by sediment dominated by:
ine dust and the remains of single-celled organisms
8) An igneous rock that solidifies below the surface is called a(n):
intrusive rock
23) The effect of transportation on a pebble's particle size is best summarized by which 23) statement?
its size decreases
26) What types of structures dominate the Valley and Ridge Province of the Appalachian 26) Mountains? A) glacially carved
large folds and thrust faults that have been eroded
9. what type of eruption is shown?
lava dome
25. which of the following is not involved in turning some sediment into sedimeantray rocks
metamorphism
3) Tuff and volcanic breccia are both composed of a variety of igneous fragments. Their 3) classification as either felsic, intermediate, or mafic therefore depends on the particular:
mineral content of each individual unit.
9) As magma is generated along a subduction zone:
minerals in the subducted plate release water, which lowers the melting temperature of the mantle material above
7) Which of the following is common during crystallization of a magma?
none
29) What type of fault is shown in this figure?
normal fault
22) Sedimentary rocks are comprised of material that comes primarily from:
other locations
11. what type of eruption is shown
pyroclastic
16) What is a main hazard of this type of volcano?
relatively small pyroclastic eruptions caused by localized explosions or collapse
17. what is a main hazard of this type of volcano
relatively small pyroclastic eruptions caused by localized explosions or collapse
24. which of the following rocks is composed of the smallest sedimantary clasts
shale
27) What type of stress formed the structure shown in this figure?
shear
23. what type of rock is shown
siltstone or shale
15) Shield volcanoes have low slopes primarily because:
the low viscosity of basaltic magma allows it to flow downhill for long distances
1. What does this texture indicate about the formation of this rock?
the magma formed some crystals before rising closer to the surface and soildifying
4) As depth increases into the Earth,:
there is an increase in temperature and pressure
2.an igneous pegmatite indicates that
there was water in the magma
19) Which of the following processes is NOT considered to be chemical weathering?
thermal expansion
21. what is the best explanation for the shape of these clasts
they have been transported a significant distance
15. what type of eruption formed the volcano in this photo
viscous lava and pyroclatisc eruptions
11) This relatively small volcanic feature consists of solidified lava and some volcanic ash. 11) What kind of volcano is it?
volcanic dome
10. which of the following would be evidence that a volcano has not been active for long
well developed soils on volcanic rocks
20. which of the following attributes does not apply to these sediments
well sorted