Geology Chapter: Weathering, Landforms, and Volcanoes

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Questions and Answers

What is weathering?

Weathering is the process of breaking down rocks, soil, minerals, and other materials at the Earth's surface.

How is weathering important to the processes of erosion, transportation, and deposition?

Weathering creates smaller particles that can be transported by wind, water, or ice. These particles are then deposited in new locations, leading to changes in the landscape.

What are the two types of weathering?

  • Natural and Artificial
  • Solid and Liquid
  • Hot and Cold
  • Physical and Chemical (correct)

What is unloading?

<p>Unloading occurs when a large weight is removed from the Earth's surface, causing the underlying rock to expand and crack.</p> Signup and view all the answers

What is freeze-thaw?

<p>Freeze-thaw weathering happens when water seeps into cracks in rocks and freezes. As water turns to ice, it expands, putting pressure on the rock and causing it to break apart.</p> Signup and view all the answers

What is salt crystal growth weathering?

<p>Salt crystal growth weathering occurs when saltwater evaporates in cracks in rocks, leaving behind salt crystals that expand and put pressure on the rock, leading to its disintegration.</p> Signup and view all the answers

What is mass wasting?

<p>Mass wasting is the downslope movement of rock, soil, and other debris under the influence of gravity.</p> Signup and view all the answers

What are the factors that facilitate fast and slow mass wasting events? (Select all that apply)

<p>Rock type (A), Gravity (B), Slope angle (C), Water content (D), Vegetation (E)</p> Signup and view all the answers

What is soil creep?

<p>Soil creep is a slow, gradual downslope movement of soil, often caused by freeze-thaw cycles, water infiltration, and the expansion and contraction of soil particles.</p> Signup and view all the answers

What is solifluction?

<p>Solifluction is the downslope movement of water-saturated soil or rock in permafrost regions. The frozen ground acts as an impermeable layer, causing water to accumulate and cause the soil to flow.</p> Signup and view all the answers

What is a mud flow/debris flow?

<p>A mud flow/debris flow is a rapid, often destructive movement of a mixture of mud, water, and rocks. These flows are typically triggered by heavy rainfall or snowmelt.</p> Signup and view all the answers

What is a landslide?

<p>A landslide is a rapid downslope movement of a large mass of rock, soil, and/or debris. Landslides are often triggered by earthquakes, heavy rainfall, or human activities.</p> Signup and view all the answers

What is an avalanche?

<p>An avalanche is a rapid, destructive flow of snow down a steep slope. Avalanches are typically triggered by unstable snow conditions, such as heavy snowfall, warm temperatures, or vibrations.</p> Signup and view all the answers

What is a laha?

<p>A laha is a fast-moving flow of water, mud, and debris caused by volcanic eruptions or heavy rainfall. Lahas can be very destructive and pose a significant hazard to downstream communities.</p> Signup and view all the answers

What is geomorphology?

<p>Geomorphology is the study of the origin, evolution, and form of landforms.</p> Signup and view all the answers

What is topography?

<p>Topography refers to the shape and features of the Earth's surface, including mountains, valleys, rivers, and other landforms.</p> Signup and view all the answers

What is relief? Explain and provide a geographic example as it relates to low relief versus high relief features on Earth.

<p>Relief is the difference in elevation between the highest and lowest points in a given area.</p> Signup and view all the answers

Explain the difference between an endogenic and an exogenic process. Provide an example of each.

<p>Endogenic processes are those that originate from within the Earth, while exogenic processes are those that operate on the Earth's surface.</p> Signup and view all the answers

What are the three tectonic forces associated with endogenic processes? What is an anticline and a syncline? How do they form?

<p>The three tectonic forces associated with endogenic processes are tension, compression, and shear. An anticline is a fold in rock layers that bends upward, like an arch. A syncline is a fold in rock layers that bends downward, like a trough.</p> Signup and view all the answers

What is an earthquake?

<p>An earthquake is a sudden release of energy in the Earth's crust, caused by the movement of tectonic plates.</p> Signup and view all the answers

What is the epicenter?

<p>The epicenter is the point on the Earth's surface directly above the focus, where an earthquake originates.</p> Signup and view all the answers

What scale are they measured on?

<p>Earthquakes are commonly measured on the Richter scale, which is a logarithmic scale that assigns a magnitude to each earthquake based on the amplitude of the seismic waves.</p> Signup and view all the answers

Explain the difference between explosive eruptions and effusive eruptions. Provide an example of each type of volcano as it relates to eruption type. Where are some volcanoes commonly located? How do they form?

<p>Explosive eruptions are characterized by rapid, violent releases of energy and gas, often resulting in ash plumes, pyroclastic flows, and widespread destruction. Effusive eruptions are characterized by the slow, steady flow of lava, which typically causes less damage but can cover large areas.</p> Signup and view all the answers

What is viscosity?

<p>Viscosity is a measure of a fluid's resistance to flow. In the context of volcanoes, viscosity refers to the resistance of magma to flow.</p> Signup and view all the answers

How has Earth's interior composition been able to be deduced?

<p>Earth's interior composition has been deduced through the study of seismic waves, which travel through the Earth's layers at different speeds and are reflected and refracted at boundaries between different layers.</p> Signup and view all the answers

What are the main layers of Earth's planetary structure? Explain all three physically and what they are composed of.

<p>The main layers of Earth's planetary structure are the crust, the mantle, and the core.</p> Signup and view all the answers

What is the lithosphere and what is it composed of?

<p>The lithosphere is the rigid outermost layer of the Earth, composed of the crust and the uppermost part of the mantle.</p> Signup and view all the answers

What is the asthenosphere? How does it facilitate plate movement?

<p>The asthenosphere is a layer of the upper mantle that is partially molten and behaves like a viscous fluid. The asthenosphere is less rigid than the lithosphere and allows the tectonic plates to move over it.</p> Signup and view all the answers

What is an igneous rock? What is meant by intrusive versus extrusive rock? What is their mineral composition difference?

<p>An igneous rock is a rock that has formed from the cooling and solidification of magma or lava. Intrusive rocks are formed when magma cools and solidifies beneath the Earth's surface. Extrusive rocks are formed when lava cools and solidifies on the Earth's surface.</p> Signup and view all the answers

What are the three major categories/classes of rock as distinguished by geologists? Provide a description and explain the differences of each.

<p>The three major categories of rock are igneous, sedimentary, and metamorphic rocks.</p> Signup and view all the answers

What is a tectonic plate?

<p>A tectonic plate is a large, rigid slab of rock that makes up the Earth's outermost layer, the lithosphere.</p> Signup and view all the answers

What are the ways plates move? How do they move? Explain the differences, provide a geographical location, and explain the landforms and features as a result of tectonic activity and movement of the plates.

<p>Tectonic plates can move in three ways: divergent, convergent, and transform.</p> Signup and view all the answers

Who is Alfred Wegener and what scientific theory did he propose?

<p>Alfred Wegener was a German geophysicist and meteorologist who proposed the theory of continental drift in the early 20th century.</p> Signup and view all the answers

What is Pangaea?

<p>Pangaea was a supercontinent that existed about 300 million years ago, when all of the Earth's continents were joined together.</p> Signup and view all the answers

What is a fault?

<p>A fault is a fracture in the Earth's crust along which there has been movement.</p> Signup and view all the answers

Seafloor spreading – how does seafloor spreading happen and where is this most common?

<p>Seafloor spreading is a process that occurs at divergent plate boundaries, where new oceanic crust is created.</p> Signup and view all the answers

What is an Earthquake? What scale are they measured on?

<p>An earthquake is a sudden release of energy in the Earth's crust, caused by the movement of tectonic plates.</p> Signup and view all the answers

Flashcards

Weathering

The process of breaking down rocks and minerals into smaller pieces.

Erosion, Transportation, Deposition

Processes related to weathering that move weathered material from one place to another.

Two Types of Weathering

Mechanical (physical) and chemical weathering.

Unloading Weathering

Rocks being exposed to lower pressures from removal of overlying material causing them to expand and crack, often in mountain ranges.

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Freeze-thaw Weathering

Water freezing expands in cracks, widening them, causing rock to break apart.

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Salt Crystal Growth Weathering

Water evaporates, leaving salt crystals that grow and put pressure on rocks.

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Mass Wasting

Downhill movement of rock and soil due to gravity.

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Soil Creep

Slow, gradual movement of soil down a slope.

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Solifluction

Slow, downslope flow of water-saturated soil.

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Mudflow/Debris Flow

Rapid flow of water and sediment down a slope, often triggered by heavy rain.

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Landslide

Rapid movement of a large mass of rock and soil down a slope.

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Avalanche

Rapid flow of snow down a slope.

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Laha

Rapid flow of hot volcanic material down a volcano.

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Geomorphology

The study of landforms and the processes that shape them.

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Endogenic Process

Processes that originate inside the Earth.

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Exogenic Process

Processes that occur on or near the Earth's surface.

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Tectonic Forces

Forces responsible for the movement and deformation of the Earth's crust.

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Earthquake

Sudden shaking of the ground caused by the movement of rocks in the Earth's crust..

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Epicenter

The point on the Earth's surface directly above the focus of an earthquake.

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Earthquake Measurement

Measured on the Richter Scale and Moment Magnitude Scale.

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Volcanic Eruptions

Explosive and effusive are types of eruptions

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Viscosity

The resistance of a liquid to flow.

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Igneous Rocks

Rocks formed from cooled magma or lava.

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Intrusive Rock

Igneous rocks that cooled slowly beneath the Earth's surface.

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Extrusive Rock

Igneous rocks that cooled quickly on the Earth's surface.

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Tectonic Plate

Large pieces of the Earth's lithosphere that move relative to each other.

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Alfred Wegener

Scientist who proposed the theory of continental drift, which was later developed into Plate Tectonics.

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Pangaea

A supercontinent that existed millions of years ago that formed to break apart to become the current continents.

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Fault

Fracture in the Earth's crust where blocks of rock have moved past each other.

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Seafloor spreading

Process where new oceanic crust forms at mid-ocean ridges.

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Weathering

The breakdown of rocks and minerals into smaller pieces

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Types of Weathering

Mechanical (physical) and chemical

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Unloading Weathering

Pressure release causes rocks to crack. Often in mountain ranges

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Freeze-Thaw Weathering

Water expands when freezing, cracking rocks

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Salt Crystal Growth Weathering

Salt crystals grow, pushing apart rocks

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Mass Wasting

Downhill movement of rock and soil (gravity)

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Soil Creep

Slow soil movement down a slope

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Solifluction

Water-saturated soil slowly flows downhill

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Mudflow/Debris Flow

Rapid flow of water and sediment

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Landslide

Rapid downhill movement of rock and soil

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Avalanche

Rapid snow flow down a slope

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Laha

Rapid flow of hot volcanic material

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Geomorphology

Study of landforms and shaping processes

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Endogenic Process

Processes originating inside the Earth

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Exogenic Process

Earth surface processes

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Tectonic Forces

Forces shaping Earth's crust

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Earthquake

Ground shaking from crustal movement

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Epicenter

Earth surface above earthquake focus

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Earthquake Measurement

Measured using Richter and Moment scales

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Volcanic Eruptions

Explosive/effusive release of volcanic material

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Viscosity

Resistance to flow in liquids

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Igneous Rocks

Rocks from cooled magma/lava

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Tectonic Plate

Large Earth crustal sections

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Alfred Wegener

Proposed continental drift

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Pangaea

Ancient supercontinent

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Fault

Fracture in Earth's crust from movement

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Study Notes

Weathering and Mass Wasting

  • Weathering is crucial for erosion, transportation, and deposition.
  • Two main types of weathering exist.
  • Unloading, freeze-thaw, and salt crystal growth weathering are explained and their dominant geographic regions are identified.
  • Factors influencing fast and slow mass wasting events are detailed.
    • Soil creep
    • Solifluction
    • Mud flow/debris flow
    • Landslide
    • Avalanche
    • Laha

Landforms

  • Geomorphology and topography are defined.
  • Relief is explained with a geographic example contrasting low and high relief.
  • Endogenic and exogenic processes are differentiated with examples.
  • Three tectonic forces associated with endogenic processes are listed.
    • An anticline is defined.

Earthquakes

  • Earthquakes are defined.
  • The epicenter is identified.
  • Measurement scales for earthquakes are specified.

Volcanoes

  • Explosive and effusive eruptions are differentiated with examples.
  • Common volcano locations are identified.
  • Factors like viscosity are discussed related to how volcanoes form.
  • Lava flow, calderas, and pyroclastic materials are defined.

Earth's Planetary Structure

  • Methods for determining Earth's interior composition are described.
  • Earth's layers (physically and compositionally) are explained.
  • Lithosphere and asthenosphere are defined along with how the latter is involved in plate movement.
  • Continental and oceanic crust are contrasted.

Rocks

  • Igneous rocks, intrusive vs. extrusive, are described.
  • Mineral composition differences between intrusive and extrusive rocks are explained.
  • Three major categories of rock are identified by geologists with a general description provided.

Plate Tectonics

  • Tectonic plate definition is provided.
  • Plate movement methods are explained.
  • Landforms and features resulting from tectonic plate movements are discussed using geographic examples.
  • Alfred Wegener and his theory regarding Pangaea are detailed.
  • Faults are defined.
  • Seafloor spreading mechanisms and common locations are discussed.
  • Earthquake measurement scales are identified.

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