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Questions and Answers
What is the common characteristic of angular unconformities, disconformities, and nonconformities?
What is the common characteristic of angular unconformities, disconformities, and nonconformities?
- They are all related to volcanic eruptions
- They all indicate periods of no geological activity
- They are all caused by meteorite impacts
- They all involve the deposition of new rock layers on eroded surfaces (correct)
Which type of unconformity is characterized by tilted or folded rock layers overlaid by horizontal rock layers?
Which type of unconformity is characterized by tilted or folded rock layers overlaid by horizontal rock layers?
- Angular unconformity (correct)
- Transitional unconformity
- Disconformity
- Nonconformity
What is the distinguishing feature of a disconformity among the types of unconformities?
What is the distinguishing feature of a disconformity among the types of unconformities?
- It occurs when sedimentary rocks are deposited on an eroded surface of crystalline rocks.
- It involves the uplift and tilting of existing rocks followed by the deposition of younger rocks.
- It represents a gap in the rock record between parallel sedimentary layers. (correct)
- It involves the erosion of tilted or folded rock layers followed by deposition of horizontal layers.
Which type of unconformity occurs between sedimentary rocks and metamorphic or igneous rocks?
Which type of unconformity occurs between sedimentary rocks and metamorphic or igneous rocks?
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