base your answer to this question on the grap...
base your answer to this question on the graph below and on your knowledge of earth science. the graph shows the decreasing percentage of a radioactive isotope, carbon - 14 (¹⁴c), as it decays and the increasing percentage of the disintegration product that forms.\n\n18. refer to figure 3 above\ncarbon - 14 can be used to determine the ages of both a\n1. quartz crystal and a calcite crystal\n2. lava flow and a granite intrusion\n3. mastodon bone and a human bone\n4. trilobite fossil and a dinosaur fossil\n\n19. refer to figure 3\nwhat is the disintegration product of this radioactive isotope?\n1. ⁴⁰ar\n2. ²⁰⁶pb\n3. ¹⁴n\n4. ⁸⁷sr
Answer
# Brief Explanations:
- For question 18: Carbon - 14 dating is used for organic materials. Mastodon and human bones are organic, while quartz, calcite, lava, granite, trilobite and dinosaur fossils are not suitable for carbon - 14 dating due to their nature (inorganic or too old for carbon - 14's effective range).
- For question 19: The radioactive decay of carbon - 14 ($^{14}C$) results in nitrogen - 14 ($^{14}N$).
# Answer:
18. 3. mastodon bone and a human bone
19. 3. $^{14}N$