What can be used to determine the relative age of two rocks?
a. vertical position
b. the presence of unconformities
c. radioactive dating of each layer
d. the relative age cannot be determined.

The presence of unconformities can be used to determine the relative age of two rocks. Therefore, the correct answer is B

Unconformity refers to a non-depositional surface which separates two strata of different age. Unconformity shows that deposited sedimentary rock was not continuous. Unconformity indicates that the older layer was exposed to erosion before the younger layer.

Further Explanation

The upper rocks, that is, the rocks that are higher than the unconformities are younger than those beneath the conformity.

In general, an unconformity indicates the period when no sediments were preserved.

The types of unconformities include

Disconformities: this is a type of unconformity between parallel layers of sedimentary rocks. It represents the time of erosion and they are characterized by some qualities of subarea emotion.Nonconformity: this is between an ingenious rock and sedimentary rock when the sedimentary rock was placed on eroded igneous rockAngular unconformity: this is a type of unconformity in which a parallel layer of sedimentary rocks are deposited on eroded layers and generate discordance with the horizontal layers.

Other types of unconformity include:

ParaconformityButtress unconformityBlended unconformity

Therefore, the presence of unconformities can be used to determine the relative age of two rocks.

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What can be used to determine the relative age of two rocks?  What can be used to determine the relative age of two rocks?  

KEYWORDS:

unconformitiesrelative agerockssedimentary rockrock layers

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Ithink the answer is a or d.