Numerical answer
The four sentences below, when properly sequenced, form a coherent paragraph. Enter the correct order as a four-digit number (e.g., 3142).
1. Only later did geologists realize that the fossils embedded in the canyon's lower strata were millions of years older than those found near its rim.
2. When the canyon was first surveyed in the nineteenth century, its sheer scale led early observers to assume its rock layers had formed within a single, relatively brief geological episode.
3. This discovery forced a complete revision of how the canyon's formation was understood, revealing a much longer and more layered history than anyone had initially proposed.
4. That assumption, though intuitive given the canyon's uniform appearance from a distance, turned out to be entirely mistaken once detailed layer-by-layer analysis began.
1. Only later did geologists realize that the fossils embedded in the canyon's lower strata were millions of years older than those found near its rim.
2. When the canyon was first surveyed in the nineteenth century, its sheer scale led early observers to assume its rock layers had formed within a single, relatively brief geological episode.
3. This discovery forced a complete revision of how the canyon's formation was understood, revealing a much longer and more layered history than anyone had initially proposed.
4. That assumption, though intuitive given the canyon's uniform appearance from a distance, turned out to be entirely mistaken once detailed layer-by-layer analysis began.
Show answer and solution
Answer: 2413
Sentence 2 introduces the initial (mistaken) nineteenth-century assumption about the canyon's formation. Sentence 4 explains that this assumption, though intuitive, was wrong once detailed analysis began. Sentence 1 gives the specific discovery (fossils in lower strata being far older) that overturned it. Sentence 3 concludes with the broader consequence — a full revision of the canyon's geological history. The coherent order is 2-4-1-3.
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