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Questions and Answers
What is an unconformity?
What is an unconformity?
- A surface indicating a stoppage in deposition or erosion between two rock sequences (correct)
- An intrusion of molten rock into existing rock layers
- A layer of rock that has been folded or tilted
- A gap in the geologic record caused by the deposition of sediment
How are unconformities created?
How are unconformities created?
- By the application of internal forces in the Earth's crust
- By the formation of gaps in rock layers during folding and tilting
- By erosion and nondeposition, or the stoppage of sediment supply (correct)
- By the squeezing of molten rock into existing rock layers
What is the challenge associated with dating rock layers?
What is the challenge associated with dating rock layers?
- The presence of unconformities or gaps in the geologic record (correct)
- The presence of faults and intrusions
- The effects of folding and tilting
- The application of internal forces in the Earth's crust
Which of the following is an example used to illustrate the concept of an unconformity?
Which of the following is an example used to illustrate the concept of an unconformity?
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What must geologists question when they find an unconformity?
What must geologists question when they find an unconformity?
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What is the source of sediment that is eventually deposited in low areas?
What is the source of sediment that is eventually deposited in low areas?
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