While conducting research on historical climate patterns, a writer took the following notes:
* In 1991, palaeoclimatologist Dr. Marcus Thorne extracted the ice core Core GISP2-B from a central Greenland site.
* In 1997, Thorne extracted Core GRIP-D from a second site located 28 kilometers east of the central site.
* Core GISP2-B contained volcanic ash layers dated to approximately 1642 BCE.
* Core GRIP-D contained a prominent sulfur anomaly measuring 82 parts per billion, dated to 1628 BCE.
* Thorne analyzed the distinct chemical signatures of both cores to differentiate between separate Bronze Age volcanic events.
The writer wants to emphasize the year Core GRIP-D was extracted, its location relative to Core GISP2-B's retrieval site, and its specific chemical anomaly. Which choice most effectively uses information from the given notes to accomplish this goal?
- Extracted in 1997 from a site 28 kilometers east of the central site where Core GISP2-B was retrieved, Core GRIP-D featured a prominent sulfur anomaly of 82 parts per billion.Cevap
- BAlthough Core GISP2-B was retrieved in 1991, the core extracted in 1997 featured a sulfur anomaly of 82 parts per billion that helped differentiate distinct Bronze Age volcanic events.
- CCore GRIP-D, which was extracted 28 kilometers east of Core GISP2-B's retrieval site, showed a sulfur anomaly of 82 parts per billion that was deposited during a high-sulfur volcanic event in 1997.
- DBecause Core GISP2-B was situated in central Greenland, the extraction of Core GRIP-D in 1997 from a site 28 kilometers to the east was necessary to prove that the sulfur anomaly of 82 parts per billion was caused by the Santorini eruption.