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Geologic Dating (Grade 8)

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Geologic Dating

The                 is the age of rock or other objects determined by the properties of the atoms that make up the materials
  1. relative age
  2. fossil age
  3. absolute age
  4. middle ages
Which describes the relative age of something?
  1. its age in comparison to the age of other things
  2. the age of something in years
  3. cannot be determined because the rock layers are always disturbed
  4. isn't really useful when studying geology
If the half-life of carbon-14 is 5,730 years, then after 5,730 years how much carbon-14 will be left in a sample?
  1. none
  2. one-fourth
  3. one-eighth
  4. one-half
Calculating the absolute age of a rock by measuring the amounts of parent and daughter materials in a rock and knowing the half-life of the parent material is called                   .
  1. radiometric dating
  2. radioactive decay
  3. half-life
  4. uniformitarianism
What is the principle of superposition?
  1. younger things are on the bottom and older things are closer to the top.
  2. younger and older things are mixed up in the layers
  3. older things are on the bottom and younger things are near to the top
  4. none of the above
Gaps in rock sequences are called                  .
  1. superposition
  2. index fossils
  3. uniformitarianism
  4. unconformities
Suppose you observe several layers of rock that have been exposed by road work. The oldest rock is probably                         .
  1. in the top layer
  2. in the middle layer
  3. in the bottom layer
  4. just below the top layer
The principle that Earth processes occurring today are similar to those that occurred in the past.
  1. principle of superposition
  2. uniformitarianism
  3. catastrophism
  4. unconformity
                are the remains of species that existed on Earth for relatively short periods of time, were abundant, and were widespread geographically.
  1. Casts
  2. Unconformities
  3. Index fossils
  4. Half-lives
A geologist examines an outcrop of rocks. She observes that an igneous dike cuts across several layers of sedimentary rocks. What can she conclude about the relative ages of the rocks? What geologic principle(s) guide her conclusion?

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