The correct option is (b) Two strata
Typically, sedimentary rocks are found in horizontal layers known as strata.
- Younger layers sit on top of older layers in undisturbed strata. The superposition law governs this.
- Other geologic elements, such as faults or intrusions, can cut strata. A fault is a rift in the crust of the Earth. A body of igneous rock known as an incursion was created within the Earth's crust.
- The feature that cuts through the other when two features intersect is younger. The law of crosscutting relationships is this.
- Index fossils, or fossils connected to a particular period in Earth's history, can be found in some strata. When the same index fossil is discovered in distant strata, it is likely that the layers were created at the same time.
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