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Question

Difficulty: EasyEstablishing Introductions and Thesis Statements

Yellowstone National Park is famous for its geothermal features, such as geysers and hot springs. Among these, Old Faithful is the most renowned, drawing millions of visitors each year who wait to watch its predictable eruptions.

[1] ____________________. Due to the high concentration of silica in the hot water, a unique glass-like rock forms around the geysers. This mineral crust, known as siliceous sinter, creates the distinct mounds and terraced structures that characterize Yellowstone’s volcanic landscape.

Which choice, if inserted at the blank in Paragraph [1], would most effectively introduce the main topic of the paragraph?

  1. A
    Yellowstone was established in 1872, it is widely considered the first national park in the world.
  2. B
    Because many visitors prefer to hike the surrounding trails instead of waiting for geysers.
  3. The chemical composition of the spring water directly contributes to the physical structures seen around the geysers.Answer
  4. D
    The hot springs are very hot in temperature and contain boiling water that is extremely heated.

Answer

The sentence stating that the chemical composition of the spring water directly contributes to the physical structures seen around the geysers is correct because it introduces the paragraph's focus on the formation of mineral crusts.
The sentence focusing on the chemical composition of the spring water and its contribution to the physical structures around the geysers is correct because it introduces the paragraph's topic of silica forming glass-like rock and mineral mounds.

Step-by-Step Solution

1
Identify the main topic of Paragraph [1] by reading the sentences that follow the blank.
The paragraph explains that high concentrations of silica in the water lead to the formation of glass-like rock and physical mounds around the geysers.
Establishing an effective introduction requires understanding the specific focus of the paragraph it introduces.
2
Evaluate the choices to find the one that best introduces this topic.
The sentence about the chemical composition of the spring water directly contributing to the physical structures matches the focus on water silica forming mounds.
An effective introduction must set up the details that follow in the paragraph.
3
Check the remaining options for grammatical errors and relevance.
The other options are eliminated due to being off-topic, containing a comma splice, being a sentence fragment, or containing redundant language.
ACT English questions require the correct choice to be both grammatically correct and rhetorically appropriate.

Key Concept

Establishing Paragraph Introductions
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Topics

Establishing Introductions and Thesis Statements

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