DISCUSSION: The problems of radiocarbon dating are discussed in the the third paragraph. Radiation intensity has changed over the years, and this reduces accuracy. See lines 40-48.
___________
- The first paragraph mentions radiocarbon dating uses “wood or other organic materials”. It never says that multiple types of materials are a problem.
- This would be in paragraph 1. That paragraph talks about getting material from shifted sediments. But paragraph 1 never talks about variable amounts being a problem.
- Tempting, but there are two problems:
1. The passage never says that some fault lines aren’t visible.
2. The passage only says that seismologists usually dig along visible fault lines (lines 2-3). Maybe radiocarbon dating can also be used on non-visible fault lines. - CORRECT. See lines 40-48. They describe this problem directly.
- This sounds right, but it’s referring to the wrong thing. Lines 44-45 say that the amount of radiation striking the upper atmosphere varies. The passage doesn’t say that radiation may have never struck the upper atmosphere.
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