When two igneous rocks are considered "equivalent" to each other other, it means they have the same...

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BlackTom AI · Accepted Answer

To begin, consider the prompt: two igneous rocks being considered 'equivalent' to each other means they share a key characteristic in common that defines their equivalence. Now evaluate each option carefully.
Option 1: composition. This is the most accurate choice because igneous rocks are commonly classified by their mineral composition (felsic, intermediate, mafic, ultramafic) and the proportions of light and dark minerals. When two rocks are equivalent, they are alike in their chemical makeup and mineralogy, which directly ties to composition.
Option 2: place of origin. While origin can influence environment or context, rock equivalence in igneous petrology does not require identical geographic source. Two rocks from different locations can be compositionally the same and still be considered equivalent.
Option 3: age. Equality of age is not what defines equivalence in this context. Two igneous rocks can be formed at vastly different times yet be compositionally identical; hence age is not the defining criterion for equivalence.
Option 4: texture. Texture relates to grain size and the arrangement of minerals, often reflecting cooling history, but rocks with similar textures can have different compositions. Therefore texture alone does not establish equivalence between igneous rocks.
In summary, the defining trait that makes two igneous rocks equivalent is their composition, since composition encapsulates the mineral and chemical identity that classifies and distinguishes igneous rocks from one another.

FA25: GEOL-103 Sec 02 - Earth Systems Quiz 1.2: Igneous Rocks (Due 9/23)

When two igneous rocks are considered "equivalent" to each other other, it means they have the same...

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