Physical and Structural Geology Exam

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Questions and Answers

Which geologic feature is formed by the divergence of tectonic plates, leading to the creation of new crust?

  • Caldera
  • Phanerozoic Eon
  • East African Rift Valley (correct)
  • Bowens Reaction Series

The Soil Profile is a uniform layer of earth material with consistent properties throughout.

False (B)

Which of the following poses a significant threat to water resources due to human activities?

  • Groundwater Contamination (correct)
  • Seismic Waves
  • Evidence of Faulting
  • Wind Deposits

What geological term refers to a large volcanic depression, typically formed by the collapse of a volcano after a major eruption?

<p>Caldera (B)</p> Signup and view all the answers

Primary Structures in geology refer exclusively to man-made constructions affecting the Earth's surface.

<p>False (B)</p> Signup and view all the answers

Which term refers to the ordered sequence of mineral crystallization from a cooling magma, as described by Norman L. Bowen?

<p>Bowens Reaction Series (A)</p> Signup and view all the answers

Briefly describe how seismic waves are used to study the Earth's interior?

<p>Seismic waves change speed and direction when encountering different materials inside the Earth, allowing scientists to infer the composition and structure of the Earth's interior.</p> Signup and view all the answers

Describe the specific role of Stratigraphy in understanding Earth’s history.

<p>Stratigraphy provides a framework for understanding the relative ages of rock layers and the geologic events that have occurred over time.</p> Signup and view all the answers

Which of the following is NOT a direct evidence of plate tectonics?

<p>Bowens Reaction Series (B)</p> Signup and view all the answers

Match the plate boundary type with its characteristic feature:

<p>Divergent Boundary = Mid-ocean ridge Convergent Boundary = Subduction zone Transform Boundary = Strike-slip fault</p> Signup and view all the answers

Which of the following factors does NOT significantly influence the weathering rate of rocks?

<p>Phanerozoic Eon (B)</p> Signup and view all the answers

What is an unconformity in geological terms?

<p>A surface that represents a break in the geologic record (A)</p> Signup and view all the answers

Define rock porosity and rock permeability, and explain how they differ.

<p>Porosity is the measure of the void spaces in a rock, while permeability is the measure of how easily fluids can flow through a rock. A rock can be porous but impermeable if the pores are not interconnected.</p> Signup and view all the answers

Artesian basins require a confined aquifer, an impermeable layer above and below, and a source of recharge at a higher elevation.

<p>True (A)</p> Signup and view all the answers

List and briefly describe three different types of mass wasting.

<p>Rockfalls (free-falling rocks), landslides (rapid slides of soil and rock), and creep (slow, gradual downslope movement).</p> Signup and view all the answers

Which of these is a feature associated with glacial erosion?

<p>U-shaped valleys (C)</p> Signup and view all the answers

Which geological structure is formed by brittle deformation?

<p>Faults (B)</p> Signup and view all the answers

Describe the key differences between normal, reverse, and strike-slip faults.

<p>Normal faults involve the hanging wall moving down relative to the footwall, reverse faults involve the hanging wall moving up, and strike-slip faults involve horizontal movement.</p> Signup and view all the answers

Explain the relationship between stress, strain, and the formation of folds in rocks.

<p>Stress is the force applied to a rock, while strain is the resulting deformation. Folds are formed when rocks undergo ductile deformation under compressional stress.</p> Signup and view all the answers

The ______ Eon, which began about 541 million years ago, marks the start of abundant fossil records.

<p>Phanerozoic</p> Signup and view all the answers

What is a key condition for the formation of folds rather than faults in rocks?

<p>High confining pressure and high temperature (A)</p> Signup and view all the answers

Calderas are exclusively formed by explosive volcanic eruptions.

<p>True (A)</p> Signup and view all the answers

The principle of ______ states that in an undisturbed sequence of sedimentary rocks, the oldest layers are at the bottom and the youngest are at the top.

<p>superposition</p> Signup and view all the answers

What type of plate boundary is most commonly associated with the formation of volcanic island arcs?

<p>Oceanic-oceanic convergent boundary (D)</p> Signup and view all the answers

Describe how the study of seismic waves has contributed to our understanding of the Earth's core.

<p>Seismic waves, specifically S-waves, cannot travel through the liquid outer core, providing evidence for its fluid state. P-wave velocities also change as they pass through the core, indicating density variations.</p> Signup and view all the answers

A surface of erosion that separates younger strata from older, deformed strata is called a(n) ______.

<p>angular unconformity</p> Signup and view all the answers

Which of the following is a critical factor determining whether a rock will deform by folding or faulting?

<p>The temperature and confining pressure acting on the rock (A)</p> Signup and view all the answers

Wind deposits are primarily composed of coarse-grained sediments due to the high energy transport capacity of wind.

<p>False (B)</p> Signup and view all the answers

Match the following types of mass wasting with their descriptions:

<p>Creep = Slow, gradual downslope movement of soil and regolith Landslide = Sudden and rapid downslope movement of a cohesive mass of soil or rock Mudflow = Rapid flow of a mixture of soil and water Rockfall = Freefall of detached rocks from a cliff or steep slope</p> Signup and view all the answers

Which of the following processes is most likely to increase both the porosity and permeability of a rock?

<p>Fracturing (D)</p> Signup and view all the answers

What are the necessary geological conditions required for an artesian aquifer to form?

<p>An artesian aquifer requires a confined aquifer (bounded by impermeable layers), a source of recharge at a higher elevation, and hydraulic pressure that allows water to rise to the surface without pumping.</p> Signup and view all the answers

Which of the following features is LEAST likely to be associated with glacial erosion?

<p>Sand Dunes (C)</p> Signup and view all the answers

Which type of fault is characterized by predominantly horizontal displacement?

<p>Strike-Slip Fault (D)</p> Signup and view all the answers

The process by which sediments accumulate in layers over time is referred to as ______.

<p>deposition</p> Signup and view all the answers

What is the age of rocks of the Phanerozoic Eon?

<p>0-541 million years (C)</p> Signup and view all the answers

What is the correct sequence of eras within the Phanerozoic Eon, from oldest to youngest?

<p>Paleozoic, Mesozoic, Cenozoic (B)</p> Signup and view all the answers

Compared to oceanic crust, continental crust is generally:

<p>Thicker and less dense (A)</p> Signup and view all the answers

Evidence of Faulting often reveals clues about the direction and magnitude of past Earth movements. Assuming a near-vertical fault plane, describe the differences in stress and rock response that lead to the formation of (a) normal faults versus (b) reverse faults. Further, what large-scale tectonic setting is each most commonly associated with?

<p>(a) Normal faults form under tensional stress (pulling apart), causing the hanging wall to move downward relative to the footwall. They are commonly associated with divergent plate boundaries. (b) Reverse faults form under compressional stress (pushing together), causing the hanging wall to move upward relative to the footwall. They are most commonly associated with convergent plate boundaries.</p> Signup and view all the answers

During glacial erosion, the grinding and scraping of rock by ice embedded with sediment produces parallel grooves known as glacial ______.

<p>striations</p> Signup and view all the answers

The principle of original horizontality suggests that sedimentary layers are typically deposited at steep angles.

<p>False (B)</p> Signup and view all the answers

To be a candidate for use as an index fossil, the organism should have...

<p>...lived for a short time and have a wide geographic distribution. (A)</p> Signup and view all the answers

Assume a sequence of undisturbed sedimentary layers. If a fault cuts through layers A, B, and C, and an intrusion 'D' cuts through layers A and B, but not C, what is the relative order of formation?

<p>A -&gt; B -&gt; D -&gt; C -&gt; Fault (A)</p> Signup and view all the answers

Flashcards

East African Rift Valley

A linear zone where the Earth's crust and lithosphere are being pulled apart and is an example of extensile tectonics.

Bowens Reaction Series

Describes the order in which minerals crystallize from magma as it cools.

The Soil Profile

The layer of mineral and organic constituents at the Earth's surface which is capable of supporting plant life.

Phanerozoic Eon

The current, latest, 'visible life' eon. Began 541 million years ago.

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Groundwater Contamination

Pollution of water sources by substances that have been released into the ground.

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Seismic Waves

Waves of energy that travel through the Earth's layers, resulting from earthquakes, volcanic eruptions, or explosions.

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Caldera

A large volcanic crater, typically formed by a major eruption leading to the collapse of the mouth of the volcano.

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Wind Deposits

Accumulations of sediment transported by the wind.

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Primary Structures

Features formed during the initial deposition or formation of a sedimentary rock or structure.

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Evidence of Faulting

Visible displacement and rupture in the geological record.

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Study Notes

  • First Semester Examinations took place in December 2014.
  • The course is Physical and Structural Geology (PE, MN, MR, GM 161).
  • The exam duration is 3 hours.

Section A

  • Write concise notes on the following geologic terms:
  • East African Rift Valley
  • Bowen's Reaction Series
  • The Soil Profile
  • Phanerozoic Eon
  • Groundwater Contamination
  • Seismic Waves
  • Caldera
  • Wind Deposits
  • Primary Structures
  • Evidence of Faulting

Section B

  • Answer any two questions from this section:
  • Explain how the Earth’s interior can be studied
  • Describe with illustrations the characteristics of Earth's layers
  • State the principles of Stratigraphy
  • Give the evidences of Plate Tectonics
  • Enumerate Plate Boundary types and associated features
  • Explain the weathering factors affecting continental crust rocks
  • Define and describe the types of unconformities
  • List the factors that affect rock porosity and permeability
  • Discuss the conditions necessary for artesian basin formation
  • Identify different Mass Wasting Types
  • Describe the characteristics of glacial erosion and deposition

Section C

  • Answer any one question from this section
  • Define Primary Structures and their geological importance
  • Describe different types of faults
  • Describe the formation and classification of folds and their various types.

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