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Unit 12 – Historical Geology REMEDIATION
1.What does the rock record tell scientists?
2.Define Uniformitarianism.
3.For what purpose might geologists use relative dating?a. to determine which rock layer in a canyon wall formed firstb. to find the age of a rock layerc. to determine how a rock’s composition has changed over timed. to identify past life forms that once lived in a rock layer
4.Define the Law of Superposition.
5.According to the principle of cross-cutting relationships, an intrusive rock body isa. deposited as sedimentary layers.b. younger than the rocks it intrudes into.c. always made of the same materials as rock around it.d. older than the rocks it intrudes into.
6.The laws of superposition and original horizontality are best applied to which rock type?
7.How does an organism become a fossil?
8.What are index fossils used for?
9.What happens as a radioactive isotope decays?
10.How far back is radiocarbon (C-14) used to date rocks?
11.About 88 percent of Earth’s history is within the time before the Phanerozoic eon, called the
12.Describe the divisions of the geologic time scale from largest to smallest.
13.Figure 1 shows which type of fossil?
Figure 1:
14.In figure 2, put the following in the order in which they formed:
a. sandstone, shale, conglomerate c. shale, sandstone, conglomerate b. conglomerate, sandstone, shale d. sandstone, conglomerate, shale
15.In figure 2, Fault B occurred ____________ the intrusion of Dike B.a. before b. after
16.In figure 2, which law did you use to answer #15?
Figure 2:
EVERYONE ANSER #17 - 2017. In figure 3, what major even occurred which marked the end of the Mesozoic Era?
a. Extinction of dinosaurs c. First dinosaurs b. First amphibians d. Mammals evolved
18.According to figure 3, the era that we are currently in is thea. Paleozoic c. Mesozoic b. Cenozoic d. Quaternary
Figure 3:
19. This is an unstable element that has too many neutrons.a. Daughter element c. Ion b. Isotope d. Hydrogen
20. Starting with 100 radioactive isotopes, what percentageof radioactive isotopes will remain after 2 half-lives?
a. 50 c. 75 b. 25 d. 12.5
