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Geography – Fundamentals of Physical Geography

Interior of the Earth

Interior of the Earth

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Study Action Plan (Sorted by Difficulty)
Earth's Interior Structure
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Difficulty Level:
High
Seismic Waves and Earthquake Mechanics
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Difficulty Level:
High
Sources of Information about Earth's Interior
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High
Intrusive Igneous Forms
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High
Volcanoes and Volcanic Landforms
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High

Learning Objectives

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Learning Objectives

  • Understand the Earth's interior structure, including the crust, mantle, and core, and the significance of the lithosphere and asthenosphere.
  • Explore the various sources of information about Earth's interior, focusing on direct methods like mining and volcanic eruptions, and indirect methods such as seismic activity and gravity anomalies.
  • Study the mechanics of seismic waves, including P-waves, S-waves, and surface waves, and their role in revealing the Earth's internal structure through phenomena like shadow zones.
  • Classify and characterize different types of volcanoes and volcanic landforms, such as shield volcanoes, composite volcanoes, and calderas, and understand their formation processes.
  • Examine the formation and characteristics of intrusive igneous forms like batholiths, laccoliths, dykes, and sills, and their significance within the Earth's crust.

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Revision Notes & Summary

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Chapter Notes

Earth's Interior Structure

  • Crust: The outermost solid part of the earth, brittle in nature. Oceanic crust is thinner (mean thickness of 5 km) compared to continental crust (around 30 km, up to 70 km in mountain regions).
  • Mantle: Extends from Moho's discontinuity to a depth of 2,900 km. The upper portion is the asthenosphere (up to 400 km), a source of magma.
  • Core: Located beyond 2,900 km. The outer core is liquid, and the inner core is solid, composed mainly of nickel and iron (nife layer).

Sources of Information about Earth's Interior

  • Direct Sources: Surface rocks, mining (e.g., gold mines in South Africa up to 3-4 km deep), volcanic eruptions, and deep drilling projects (e.g., Kola drill reaching 12 km).
  • Indirect Sources: Analysis of temperature, pressure, and density changes with depth; meteors; gravitational and magnetic field variations; seismic activity.

Seismic Waves and Earthquake Mechanics

  • Types of Waves:
    • P-waves (Primary waves): Fastest, travel through solids, liquids, and gases.
    • S-waves (Secondary waves): Slower, travel only through solids.
    • Surface waves: Most destructive, cause displacement of rocks.
  • Shadow Zones: Areas where seismic waves are not detected; S-waves do not travel through the liquid outer core, creating larger shadow zones.

Volcanoes and Volcanic Landforms

  • Types of Volcanoes:
    • Shield Volcanoes: Large, basaltic, low-explosivity unless water enters the vent.
    • Composite Volcanoes: Explosive, cooler, viscous lavas, layers of pyroclastic material.
    • Calderas: Most explosive, collapse on themselves, forming depressions.
    • Flood Basalt Provinces: Extensive lava flows, e.g., Deccan Traps.
    • Mid-Ocean Ridge Volcanoes: Frequent eruptions along oceanic ridges.

Intrusive Igneous Forms

  • Batholiths: Large, dome-shaped, granitic bodies formed deep in the crust.
  • Lacoliths: Dome-shaped, connected by a conduit, source of surface lava.
  • Lapoliths and Phacoliths: Saucer-shaped or wavy masses, found at synclines or anticlines.
  • Sills and Dykes: Horizontal bodies (sills) or vertical structures (dykes) formed by solidified lava in cracks and fissures.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

The outer core is too dense.

B.

The outer core is liquid.

C.

The outer core is too hot.

D.

The outer core is too far from the surface.
Correct Answer: B

Solution:

S-waves cannot travel through liquid, and the Earth's outer core is in a liquid state.

Chapter Concept:

Seismic Waves and Earthquake Mechanics

A.

Reflection of seismic waves at the crust.

B.

Refraction of seismic waves at the core-mantle boundary.

C.

Absorption of seismic waves by the mantle.

D.

Diffraction of seismic waves by the lithosphere.
Correct Answer: B

Solution:

The shadow zone is formed due to the refraction of seismic waves at the core-mantle boundary, causing them to bend and create areas where no waves are detected.

Chapter Concept:

Earth's Interior Structure

A.

It acts as a rigid layer that plates slide over.

B.

It is a semi-fluid layer that allows the lithosphere to move.

C.

It is the outermost layer of the Earth, forming the surface.

D.

It is the solid core that supports the mantle.
Correct Answer: B

Solution:

The asthenosphere is a semi-fluid layer beneath the lithosphere, allowing the tectonic plates to move over it.

Chapter Concept:

Earth's Interior Structure

A.

At the base of synclines or top of anticlines in folded regions.

B.

In a large dome-shaped structure at great depths.

C.

As a vertical wall-like structure in fissures.

D.

As a horizontal sheet-like intrusion near the surface.
Correct Answer: A

Solution:

Phacoliths form as wavy masses of intrusive rocks at the base of synclines or top of anticlines.

Chapter Concept:

Intrusive Igneous Forms

A.

They have highly explosive eruptions

B.

They erupt fluid basaltic lava with low explosivity

C.

Their eruptions result in large pyroclastic flows

D.

They form large calderas upon eruption
Correct Answer: B

Solution:

Shield volcanoes are characterized by the eruption of fluid basaltic lava, which typically has low explosivity unless water enters the vent.

Chapter Concept:

Volcanoes and Volcanic Landforms

A.

P-waves; the core is partially solid

B.

S-waves; the outer core is liquid

C.

Surface waves; the mantle is semi-solid

D.

Body waves; the crust is rigid
Correct Answer: B

Solution:

S-waves cannot travel through liquid, which implies that the Earth's outer core is in a liquid state, as evidenced by the absence of S-waves in the shadow zone.

Chapter Concept:

Sources of Information about Earth's Interior

A.

An area where no seismic waves are recorded.

B.

An area where only P-waves are recorded.

C.

An area where only S-waves are recorded.

D.

An area where both P and S-waves are recorded.
Correct Answer: A

Solution:

The shadow zone is an area where seismic waves are not recorded due to the refraction and reflection of waves within the Earth.

Chapter Concept:

Seismic Waves and Earthquake Mechanics

A.

They indicate the presence of volcanic materials.

B.

They reveal variations in the Earth's magnetic field.

C.

They provide information about the distribution of mass within the Earth's crust.

D.

They help in determining the temperature of the Earth's core.
Correct Answer: C

Solution:

Gravity anomalies help in understanding the distribution of mass within the Earth's crust. Variations in gravitational force at different locations indicate uneven distribution of mass, which can be used to infer the structure and composition of Earth's interior.

Chapter Concept:

Sources of Information about Earth's Interior

A.

Lithosphere

B.

Asthenosphere

C.

Outer Core

D.

Inner Core
Correct Answer: B

Solution:

The asthenosphere, located beneath the lithosphere, is the main source of magma that rises to the surface during volcanic eruptions.

Chapter Concept:

Earth's Interior Structure

A.

By measuring the temperature at different depths

B.

By indicating variations in the Earth's magnetic field

C.

By revealing uneven mass distribution within the Earth's crust

D.

By showing the chemical composition of the core
Correct Answer: C

Solution:

Gravity anomalies occur due to uneven distribution of mass within the Earth's crust, providing clues about its internal structure.

Chapter Concept:

Sources of Information about Earth's Interior

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Interior of the Earth

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True or False

Correct Answer: True

Solution:

Calderas are the collapsed depressions that form when a volcano erupts explosively and the magma chamber empties, causing the volcano to collapse.

Chapter Concept :

Volcanoes and Volcanic Landforms

Correct Answer: True

Solution:

Seismic activity provides crucial information about the Earth's interior, as it helps in understanding the structure through the study of seismic waves.

Chapter Concept :

Earth's Interior Structure

Correct Answer: True

Solution:

Dykes form when lava makes its way through cracks and fissures in the land and solidifies almost perpendicular to the ground, creating a wall-like structure.

Chapter Concept :

Intrusive Igneous Forms

Correct Answer: False

Solution:

The shadow zone of S-waves is much larger than that of P-waves.

Chapter Concept :

Seismic Waves and Earthquake Mechanics

Correct Answer: False

Solution:

Shield volcanoes are mostly made up of basalt, a type of lava that is very fluid when erupted, and are characterized by low-explosivity unless water enters the vent.

Chapter Concept :

Volcanoes and Volcanic Landforms

Correct Answer: False

Solution:

The Earth's core consists of an outer liquid layer and an inner solid layer, as described in the text.

Chapter Concept :

Earth's Interior Structure

Correct Answer: True

Solution:

The lithosphere is composed of the crust and the uppermost solid part of the mantle, as indicated in the provided text.

Chapter Concept :

Earth's Interior Structure

Correct Answer: True

Solution:

Volcanic necks form when magma solidifies within the vent of an extinct volcano, leaving a column of igneous rock.

Chapter Concept :

Volcanoes and Volcanic Landforms

Correct Answer: True

Solution:

P-waves, also known as primary waves, are similar to sound waves and can travel through gaseous, liquid, and solid materials.

Chapter Concept :

Seismic Waves and Earthquake Mechanics

Correct Answer: False

Solution:

Gravity anomalies are considered an indirect source of information about the Earth's interior as they provide insights into the distribution of mass within the Earth.

Chapter Concept :

Sources of Information about Earth's Interior

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