The debate over the primary cause of the dinosaurs' extinction 66 million years ago has long centered on two main hypotheses: a massive asteroid impact and large-scale volcanic activity. The impact theory gained significant traction with the discovery of the Chicxulub crater in Mexico, dated precisely to the extinction event. This impact would have thrown vast amounts of dust and debris into the atmosphere, blocking sunlight, causing global cooling, and disrupting photosynthesis. Alternatively, the volcanic theory points to the Deccan Traps in India, a massive volcanic province that erupted around the same time, releasing enormous quantities of greenhouse gases and other pollutants. Some scientists now propose that both events may have contributed, with the ecosystem already stressed by volcanism being pushed over the edge by the asteroid impact.
What is the main subject being discussed and explored in the passage?
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The passage is primarily concerned with which of the following?
The debate over the primary cause of the dinosaurs' extinction 66 million years ago has long centered on two main hypotheses: a massive asteroid impact and large-scale volcanic activity. The impact theory gained significant traction with the discovery of the Chicxulub crater in Mexico, dated precisely to the extinction event. This impact would have thrown vast amounts of dust and debris into the atmosphere, blocking sunlight, causing global cooling, and disrupting photosynthesis. Alternatively, the volcanic theory points to the Deccan Traps in India, a massive volcanic province that erupted around the same time, releasing enormous quantities of greenhouse gases and other pollutants. Some scientists now propose that both events may have contributed, with the ecosystem already stressed by volcanism being pushed over the edge by the asteroid impact.
What specific consequence of the asteroid impact is mentioned as a cause of disruption?
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According to the passage, the asteroid impact theory suggests that the extinction was partly caused by:
Dark matter and dark energy are two of the greatest mysteries in modern cosmology. While dark matter is thought to provide the gravitational scaffolding for the formation of galaxies, its exact nature remains unknown; it does not emit, absorb, or reflect light, making it invisible to current detection methods beyond its gravitational effects. Dark energy, on the other hand, is even more enigmatic. It is hypothesized to be a pervasive force causing the accelerated expansion of the universe. Together, these two components are believed to constitute over 95% of the total mass-energy content of the universe, with ordinary, visible matter making up less than 5%.
How can scientists infer the presence of dark matter, according to the text?
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The passage states that dark matter is undetectable by current methods EXCEPT through its:
Dark matter and dark energy are two of the greatest mysteries in modern cosmology. While dark matter is thought to provide the gravitational scaffolding for the formation of galaxies, its exact nature remains unknown; it does not emit, absorb, or reflect light, making it invisible to current detection methods beyond its gravitational effects. Dark energy, on the other hand, is even more enigmatic. It is hypothesized to be a pervasive force causing the accelerated expansion of the universe. Together, these two components are believed to constitute over 95% of the total mass-energy content of the universe, with ordinary, visible matter making up less than 5%.
What does the passage imply about the current understanding of dark energy?
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It can be inferred from the passage that scientists:
The concept of 'emotional intelligence' (EI) gained widespread popularity in the 1990s, referring to the ability to perceive, control, and evaluate emotions—in oneself and others. Proponents argue that EI is a critical factor for personal and professional success, potentially more important than traditional cognitive intelligence (IQ). They suggest that individuals with high EI are better at navigating social complexities, managing stress, and motivating themselves and others. However, some critics question the scientific validity of EI as a distinct form of intelligence, arguing that it overlaps significantly with personality traits and that its measurement is often subjective and unreliable. Despite these debates, EI concepts have been widely adopted in leadership training and educational programs.
How does the author organize the information about emotional intelligence?
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Which of the following best describes the structure of the passage?
GRE Reading Comprehension Practice Quiz 2
Insightful Reader!
Your ability to dissect passages is remarkable!
Getting the Gist!
You're on the right track. Focus on pinpointing main ideas and supporting details.
Closer Reading Needed!
Take your time with each passage to fully understand its meaning and structure.
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