Reading Comprehension Practice Test

Reading Comprehension Advanced Reading Comprehension and Analysis

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Read the following passage and answer the question. Scientists have long debated the origins of the Moon. The most widely accepted theory today is the Giant Impact Hypothesis, which proposes that a Mars-sized body called Theia collided with the early Earth approximately 4.5 billion years ago. The resulting debris from this collision coalesced over time to form the Moon. Evidence supporting this theory includes the Moon's similar oxygen isotope ratios to Earth and its relatively low iron content compared to Earth's core. What is the main idea of this passage?
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