1. Relative dating works best in sedimentary rock. True or False? 2. Numerical d
ID: 293095 • Letter: 1
Question
1. Relative dating works best in sedimentary rock. True or False? 2. Numerical dating is based upon radioactive isotopes True or False 3. Relative dating uses years to tell how old a rock or event is True or False 4. Relative dating is very accurate, but not very precise. True or False 5. The geologic time scale was historically based on relative dating True or False 6. A half-life is the time it takes for half of the radioactive isotopes present in a sample to decay. True or False 7. What dating works best with igneous rock?
Explanation / Answer
ANSWER
1. True - Relative Dating is a method in which fossils and layers of rock are placed in order from older to younger.Sedimentary rock typically is layered, with the layers derived from different periods of sediment accumulation.
2. True - Numerical dating is finding the number of years that have passed since an event occurred. The time required to calculate the number of years uses half-life of radioactive isotopes.
3. False - Relative dating uses the relative order of past events without necessarily determining their absolute age.
4. True- Relative dating is highly accurate but does not establish precise dates for specific remains but rather their relationship to a series of remains.
5. True- Relative dating makes out the relative time period which builds geological timescale. Geologic time is usually diagramed in tall columnar diagrams like this. Just like a stack of sedimentary rocks, time is recorded in horizontal layers, with the oldest layer on the bottom, superposed by ever-younger layers, until you get to the most recent stuff on the tippy top which indicates relative age dating.
6.True
7. Radiometric dating works best on igneous rocks, which are formed from the cooling of molten rock, or magma. As magma cools, radioactive parent isotopes are separated from previously formed daughter isotopes by the crystallization process.
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