LSAT Reading Comprehension 3
Please take a moment to complete this quiz.
Please answer the following question about passage 3:


Which of the following most accurately states the main point of the passage?

The worst day in the history of life on Earth, so far, happened almost exactly 66 million years ago, when an asteroid roughly the size of Manhattan slammed into the Yucatán Peninsula.

You may know the story. The asteroid—which arrived, probably, in June or July—immediately drilled a 20-mile hole into the planet’s surface, vaporizing bedrock and spewing it halfway to the moon. The planet shuddered with magnitude-12 earthquakes, loosing tsunamis across the Gulf of Mexico. Some of the ejected debris condensed in orbit and plunged back to Earth as searing spheres of molten glass, which torched the land and turned forests into firestorms. Other debris remained high in space, where it blocked the sun’s rays and began to chill the surface of the planet.

The impact changed the chemical content of the ocean, rendering seawater more acidic and inhospitable to the tiny plankton that form the base of the marine food chain. Combined with the other effects of the asteroid—darkened skies and a snap of global cooling—this ecologic disruption doomed much of life on Earth.

How does an asteroid prompt an extinction? It chooses the right location. The Yucatán Peninsula was an excellent one, says Pincelli Hull, an author of the paper and a geology professor at Yale. The peninsula is essentially an “old buried reef,” she told me, an accumulation of dead coral and other sea life that is now more than a mile thick. When the asteroid hit, untold megatons of that old organic material—rich in nitrogen and sulfur—instantly became dust and shot up into the atmosphere.

Soon it began to fall back down, now as nitric oxide and sulfuric acid. “It was raining brimstone and acid from the sky,” Hull said. The air would have reeked of acrid smog and burnt matches. The acid accumulated in the oceans, wearing away the shells of the small, delicate plankton that serve as the basis of the marine food chain. Within a few centuries of the impact, ocean acidity had jumped by at least 0.3 pH units.

This spike in ocean acidification may have lasted for less than 1,000 years. But even that pulse “was long enough to kill off entire ecosystems for sure,” Hull said.  This pulse—called the K-T pulse—of ocean acidification also likely worsened other sweeping environmental changes wrought by the impact, such as the years-long darkness caused by orbiting debris and ash from the global wildfires.

With this new finding, it now appears that all three of the worst mass extinctions in Earth’s history featured huge spasms of ocean acidification. And that pattern is worrying, because the oceans are acidifying again today. Carbon dioxide—the same air pollutant that causes global warming—also dissolves in the oceans and increases the acidity of seawater. Since the late 1980s, the planet’s oceans have become about 0.02 pH units more acidic every decade, according to a report last month from the Intergovernmental Panel on Climate Change. More than a fifth of all modern carbon pollution has already dissolved into the oceans, the report also found.

Modern acidification is not yet at the same magnitude as the K-T pulse. It’s “moving toward that scale, but it’s not quite there yet,” Hull said. What unites our world and the K-T period, she said, is that a number of environmental catastrophes can overlap with ocean acidification to produce a major upheaval.

Source







Use our LSAT Practice Tests (updated for 2020) to achieve your best score. The Law School Admission Test (LSAT) is a standardized test used in the admissions process for most law schools in the United States and Canada. While some law schools do accept scores from tests other than the LSAT, the LSAT is the only test accepted by all ABA-accredited law schools in the United States, as well as all Canadian common-law law schools.

The LSAT was developed in order to assess the necessary skills needed in order to be successful in law school, including:

    • Reading Comprehension
    • Analytical Reasoning
    • Logical Reasoning

Performance on The LSAT Test is vital for any student wishing to attend an ABA-accredited law school in the United States, or any common-law law school in Canada. To prepare for the LSAT, try our free LSAT practice tests. For more serious preparation, see our review of the best LSAT prep courses

LSAT TEST CONTENT DESCRIPTION

The LSAT includes four seperate scored multiple-choice sections, and one unscored writing sample. Each scored section is comprised entirely of multiple-choice questions, and candidates are given 35 minutes to complete each section. The included sections are as follows:

  • Logical Reasoning Section 1
  • Logical Reasoning Section 2
  • Analytical Reasoning
  • Reading Comprehension
  • Writing Sample

Be sure you are utilizing all available LSAT practice tests in order to ensure you are familiar with each different section of the LSAT. The LSAT test is comprised of the following subtests:

LOGICAL REASONING SECTION 1 (24-26 ITEMS, 35 MINUTES)

The Logical Reasoning Section 1 portion of the LSAT is designed to assess the candidates ability to analyze and evaluate arguments and assess validity. Candidates will be required to determine an argument’s strength or weakness, as well as what causes the argument to be strong or weak.

This section includes 24-26 argument-based multiple choice questions, and candidates are given 35 minutes to complete it.

LOGICAL REASONING SECTION 2 (24-26 ITEMS, 35 MINUTES)

The Logical Reasoning Section 2 portion of the LSAT is identical to the Logical Reasoning Section 1 portion, just with different questions. Like its predecessor, it is designed to assess the candidates ability to analyze and evaluate arguments and assess validity. Candidates will be required to determine an argument’s strength or weakness, as well as what causes the argument to be strong or weak.

This section includes 24-26 argument-based multiple choice questions, and candidates are given 35 minutes to complete it.

ANALYTICAL REASONING SECTION (23-24 ITEMS, 35 MINUTES)

The Analytical Reasoning Section of the LSAT is often referred to as the “Logic Games” portion of the test. Candidates must use deductive reasoning and find structure within a set of organized data in order to demonstrate their skills in basic logic. Some skills required in order to be successful on this section of the test may include:

  • Matching Skills
  • Sequencing Skills
  • Both Matching and Sequencing Skills

This section includes 23-24 multiple choice questions which are based on the included “Logic Games” passages. Candidates are given 35 minutes to complete it.

READING COMPREHENSION SECTION (26-28 ITEMS, 35 MINUTES)

The Reading Comprehension Section of the LSAT assesses a candidate’s ability to read and comprehend a given scholarly passage. Some skills required in order to be successful on this section of the test may include:

  • Identifying Main Idea and Details
  • Drawing Inferences
  • Making Extrapolations

This section includes 26-28 multiple choice questions which are based on the included scholarly passages. Candidates are given 35 minutes to complete it.

WRITING SAMPLE (1 ESSAY, 35 MINUTES)

The Writing Sample Section of the LSAT is not graded, but is sent to law schools and may be used in their admission process. On this section, candidates are asked to argue one particular position over another. Candidates will be expected to not only support their own position, but also to knock down the opposing position.

This section includes 1 essay question in which the writer will support one position while knocking down the other. Candidates are given 35 minutes to complete it.

It is important to use the appropriate LSAT practice tests and study materials in order to be prepared for each section of the LSAT.