Geology (GLGY 461-UCAL) Final Exam
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Question 1 |
Shallow mesogenesis occurs at what ranges of temperature and depth?
A | 30 - 50 deg C and 1 -2 km of depth |
B | 70 - 100 deg C and 2 -3 km of depth |
C | 100 - 150 deg C and 3 - 4 km of depth |
D | 0 - 60 deg C and 1 - 2 km of depth |
Question 2 |
Lowering of pH in the environment will lead to....
A | ...increase in precipitation of carbonate minerals. |
B | ...increase in organic activities. |
C | ...dissolution of carbonate minerals. |
D | ....increased in formation of mixed clays. |
Question 3 |
What are the primary factors that affect the formation of peat?
A | The porosity and the drainage of water and water soluble chemical compounds. |
B | The amount of clay available in the soil composition. |
C | The amount and seasonality of rainfall. |
D | The temperature and humidity of the environment. |
E | The type of soil forming bacteria and chemical compounds within the sub layers of sediments. |
Question 4 |
What is the most common framework mineral for sedimentary rocks?
A | Quartz |
B | Feldspar |
C | Clay minerals |
D | Volcanic grains |
E | Plutonic grains |
Question 5 |
Pedphemesis is highly altered by the changes in....
A | seasonality of rainfall. |
B | global temperature change. |
C | change in sea levels. |
D | change in regional temperature. |
E | change in global temperature. |
Question 6 |
Global variations in carbonate composition of ooids and unaltered cements can be directly linked to (mainly attributed to)....
A | the composition of the sea water. |
B | increase and decease in global temperature. |
C | cyclic global warming/cooling events. |
D | rate of carbonate deposition at sea. |
E | type of organisms. |
Question 7 |
Paleosols are best indicators of what paleo-environment or environmental condition?
A | Subaerial exposure |
B | Increase in sea level |
C | Past organic conditions |
D | Past basins |
Question 8 |
What can be directly linked to the maturity of paleosols?
A | Organic activity rate. Higher the organic activity, higher the maturity of the paleosols. |
B | Organic activity rate. Higher the organic activity, lower the maturity of the paleosols. |
C | Sediment accumulation rate. Lower the rate, higher the maturity of paleosols. |
D | Sea level transgression. More mature paleosols forms with the increase in sea level. |
Question 9 |
Which of the statement is true about silica?
A | Silica is added to the seawater from rivers. |
B | Silica is removed from seawater by evaporation. |
C | Silica in opal-A will dissolve first before the silica in quartz as temperature increase. |
D | Solubility of silica much higher in lower pH (<5) waters. |
Question 10 |
If you discover cutans in a stratigraphical column, what would be your best interpretation of the environment?
A | Oxygen rich and well drained environment. |
B | Nutrients rich environment above the below table. |
C | Nutrients rich environment above the water table. |
D | Clay rich and Well drained region above the water table. |
Question 10 Explanation:
Few answers are "correct", but only one is better. In difficult exams, you should be able to pick the best choice.
Question 11 |
When will the Kaolinite will transform into dickite?
A | Under shallow mesogenesis with high concentration of potassium. Hint: If K is high, it will form illite. |
B | Under shallow mesogenesis with low concentration of potassium. |
C | Deep mesogenesis with low concentration of potassium. |
D | Deep mesogenesis with high concentration of potassium. |
Question 12 |
In an open system with fluid flux driven reactions, the removal of sodium (Na) and potassium (K) from feldspars will form what type of clay mineral?
A | illite |
B | kaolinite |
C | smectite |
D | dickite |
Question 13 |
What is the typical scale of a soil horizon boundaries?
A | mm to cm scale |
B | m to km scale |
C | mm to km scale |
D | cm to m scale |
Question 14 |
Grain size range of 62.5 to 125 microns is classified as what grain-size grade?
A | Granular |
B | Fine sand |
C | Medium sand |
D | Very fine sand |
E | Medium sand |
Question 15 |
What is the most important factor for sediment accumulation?
A | holes (depressions) |
B | eustasy (sea level) |
C | type of bedrock |
D | chemical and physical composition of sediments |
Question 15 Explanation:
The key is to have a depression (a hole/basin) in order to accumulate seds. That is the most fundamental item needed.
Question 16 |
What is the difference between pedoturbation and bioturbation?
A | Both are the same but pedoturbation occur naturally and bioturbation caused by animal activities. |
B | They are different. Pedoturbation occur as a result of chemical changes due to sediments and bioturbation caused by animal activities. |
C | They are different because bioturbation process requires oxygen and pedoturbation does not. |
D | They are the same but bioturbation forms soil primarily using animal waste while pedoturbation forms soil by compaction of sediments. |
Question 17 |
Which of the statements are true about external sources of silica?
A | In order to deposit this type of silica, large volume of water must flow through rocks (in which they deposit). |
B | This type of silica is limited to large scale depositional environments. |
C | External silica is extensively provided by organisms. |
D | The precipitation of external silica occurs when the in situ concentration of silica is supersaturated with respect to CO2. |
Question 18 |
The solubility of opal-A is primarily driven by....
A | temperature. |
B | pH level. |
C | abundance of quartz/silica. |
D | abundance of marine-sediments in pore waters. |
Question 19 |
The bedded charts lack internal sedimentary structures.
A | True |
B | False |
Question 20 |
What is the best description for a conglomerate that was composed of fragments of older rocks? Assume you know nothing else about the sample.
A | Extraformational conglomerate |
B | Intraformational conglomerate |
C | Oligomict conglomerate |
D | Polymict conglomerate |
E | Epiclastic conglomerate |
Question 20 Explanation:
With the limited information, the only thing we can say; it is Epiclastic by definition.
Question 21 |
What is the most fundamental unit of soil structure?
A | Cutans |
B | Coats |
C | Peds |
D | Horizons |
Question 22 |
Which of the following is a true statement on roots/ rootlets /rhizoliths in paleosols.
A | Original organic matter is often preserved. |
B | Roots are more commonly found than root molds and rhizoliths. |
C | Branching of roots only occur above the water table. |
D | Drab halos are formed as a result of aerobic microbial reactions. |
E | Rhizoliths are formed as a result of replacement reactions. |
Question 23 |
The seal level transgression and regression is primarily driven by what factor?
A | tectonics |
B | annual rainfall (global) |
C | volume of water produced by springs, rivers, etc |
D | changes in global temperature or climate Hint: This is what the media is reporting with respect to Global Warming issue. However, this is NOT the primary force behind sea level change. |
Question 24 |
During burial diagenesis, what is the first transformation of the opal-CT?
A | opal-CT into mega-quartz |
B | opal-CT into opal-A |
C | opal-CT into micro-quartz |
D | opal-CT into nodular chert |
Question 25 |
Mottling in paleosols develop during what stage of soil formation?
A | Very late stage |
B | During development (somewhere in the middle) |
C | Very early stage |
D | During the entire pedogenisis process. |
Question 26 |
What element or compound is released at the end of the albitization of detrital plagioclase?
A | Al3+ |
B | O2 |
C | Mg2+ |
D | Water |
Question 27 |
Which of the following statements are true for aragonitic sea?
A | Aragonite is favored by increased in temperature and decrease in Mg and SiO4. |
B | Aragonite is favored by decreased in temperature, Mg and SiO4. |
C | Aragonite is favored by increased in temperature, Mg and SiO4. |
D | Aragonitic seas corresponds to high sea levels due to increase in activity at oceanic spreading centers. |
Question 28 |
Blocky carbonate cements such as ferroan dolomite and calcite are inhibited by...
A | decrease in activity of CO2 gas. |
B | increase in the organic acid reactions (carboxylic acid for ex). |
C | increase in HCO3. |
D | decease in temperature. |
Question 29 |
Reduction in porosity due to mechanical and chemical compaction with depth will result in...
A | very high flow rates as sediments get compacted. |
B | high amount of salinity driven reactions. |
C | high temperature driven reactions with fast reaction rates. |
D | mineral reactions as a result of the high rate of de-hydration and hydration cycles. |
Question 30 |
When freshwater penetrates into sediments with marine pore-waters, the waters within the pore space will remain ______ with respect to silicate minerals for a long period of time.
A | saturated |
B | supersaturated |
C | unchanged (equilibrium state) |
D | undersaturated |
Question 31 |
Which of the following "type" of chert deposition will result in opal-A rich composition (in chert)?
A | Radiolaria |
B | Diatoms |
C | Spicular |
D | Nodular |
Question 32 |
The composition of metamorphic rocks formed under humid conditions are characterized by....
A | high proportion of lithic fragments. |
B | high proportion of quartz. |
C | high proportion of feldspars. |
D | high proportion of angular clasts. |
Question 33 |
What causes the formation of chert in alkaline lakes?
A | Low solubility of quartz. |
B | Very high pH (over 9). |
C | Low temperature with respect to the environment. |
D | High concentration of opal-A. |
Question 34 |
Illite is a type of clay. Which of the following statements are true about Illite?
A | It is a pore-filling and grain-rimming cement that precipitate by replacing the previously formed smectite. |
B | It is a pore-filling cement that precipitate by consuming minerals from pore waters and it replaces kaolinite. |
C | It is pore-filling and grain-rimming cement in which the precipitation is enhanced by deceased in temperature. |
D | It is a grain-rimming cement that precipitate as a result of increase in the activity of carbon dioxide in pore water. |
Question 34 Explanation:
This is a hard question because most of the answers above is partially right. But only ONE can be considered as perfect statement.
Question 35 |
Which of the following are characteristics of microquartz?
A | Equant grains with greater than 20 um in size. |
B | Equant grains with less than 20 um in size. |
C | Elongated grains with less than 20 um in size. |
D | Elongated grains with greater than 20 um in size. |
Question 36 |
Which of the following can be used to identify plutonic quartz?
A | Monocrystalline, undulatory extinction, relative lack of inclusions. |
B | Monocrystalline, undulatory extinction, relative lack of inclusions. |
C | Polycrystalline, straight extinction, relative lack of inclusions. |
D | Monocrystalline, straight extinction, some vacuoles. |
E | Polycrystalline, >5-deg extinction, relative lack of inclusions. |
Question 37 |
Which of the following can be used to identify recrystallized metamorphic quartz?
A | Straight or slightly-undulose extinction and straight boundaries between grains. |
B | Elongated subgrains with crenulated boundaries. |
C | Straight extinction and large volume of vacuoles. |
D | Radiating fibers within sub-grains and highly-undulose extinction. |
Question 38 |
Autocyclic controls are independent of allocyclic controls on sedimentation.
A | True |
B | False |
Question 39 |
When classifying conglomerates, rocks with stable clasts of one type known as __I__ and rocks with a mixture of unstable and metastable clasts known as __II__.
A | I. petromict II. oligomict |
B | I. petromict II. polymict |
C | I. oligomict II. polymict |
D | I. oligomict II. petromict |
E | I. polymict II. petromict |
F | I. polymict II. oligomict |
Question 40 |
Which of the following porosity type depended on the type of fabric (fabric selective)?
A | Moldic |
B | Vug |
C | Channel |
D | Fracture |
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