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