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Difficulty: Very hardRhetorical Synthesis: Introduction and Definition

While preparing a presentation on plate tectonics, a student took the following notes:
* Ophiolites are fragments of Earth's oceanic crust and the underlying upper mantle that have been uplifted and exposed on land.
* These geological structures are typically preserved within continental mountain ranges, such as the Alps or the Himalayas.
* The term "ophiolite" was first introduced by French mineralogist Alexandre Brongniart in 1813.
* Geologists study ophiolites because they offer a rare opportunity to examine the deep oceanic lithosphere without drilling.

The student wants to introduce ophiolites and define what they are. Which choice uses information from the notes to accomplish this goal?

  1. A
    Typically preserved within continental mountain ranges like the Alps or the Himalayas, ophiolites were first named by Alexandre Brongniart in 1813.
  2. B
    Because they offer a rare opportunity to examine the deep oceanic lithosphere without drilling, ophiolites are heavily studied by modern geologists.
  3. Ophiolites, which are fragments of Earth's oceanic crust and upper mantle uplifted and exposed on land, provide geologists with a rare opportunity to study the deep oceanic lithosphere.Answer
  4. D
    Geologists study ophiolites—structures typically preserved in continental mountain ranges—to reconstruct plate tectonic movements without drilling.

Answer

Ophiolites, which are fragments of Earth's oceanic crust and upper mantle uplifted and exposed on land, provide geologists with a rare opportunity to study the deep oceanic lithosphere.
The option that defines ophiolites as fragments of Earth's oceanic crust and upper mantle uplifted and exposed on land correctly introduces the subject and provides its definition.

Step-by-Step Solution

1
Analyze the prompt to identify the specific rhetorical goals.
The student wants to achieve two goals: introduce the subject of ophiolites and define what they are.
Understanding the precise prompt constraints allows us to eliminate choices that do not address both requirements.
2
Evaluate the notes to locate the definition of ophiolites.
The first note defines ophiolites as fragments of Earth's oceanic crust and the underlying upper mantle that have been uplifted and exposed on land.
This information is required to formulate the definition requested by the prompt.
3
Examine each choice to determine which one successfully introduces the term and incorporates this definition.
The correct choice introduces 'Ophiolites' and characterizes them using the definition from the first note, while the other choices merely describe where they are found, why they are studied, or their naming history without defining them.
Synthesizing the introduction and definition is the only way to satisfy the prompt's criteria.

Key Concept

Rhetorical Synthesis: Introduction and Definition
Estimated Time:1m 0s
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Topics

Rhetorical Synthesis: Introduction and Definition

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