Rocks are composed primarily of minerals.

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Question restatement: The assertion is that rocks are composed primarily of minerals.

Option analysis is limited here because no answer choices are provided to evaluate individually. Nevertheless, we can reason about the statement itself.

First, consider the general geology definition: a rock is a natural, solid aggregate composed of one or more minerals. Minerals are the crystalline, inorganic substances with defined chemical compositions and structures. By this standard definition, most rocks are indeed made up of minerals such as quartz, feldspar, mica, calcite, and others that come together to form igneous, metamorphic, and sedimentary rocks.

Second, address potential edge cases to understand the nuance. There exist mineraloids (like obsidian, volcanic glass, or opal) that are not minerals because they lack a crystalline structure. Some rocks may contain organic components (like coal) or glassy phases that are not strictly mineral in nature, which can be seen as exceptions to a strict mineral-only composition. However, even in many coal-like or glassy rocks, the bulk material corresponds to mineral content or mineral-like compounds, and for the majority of conventional rocks, minerals are the dominant constituents.

Third, interpret the qualifier "primarily" in the statement. The word implies that while minerals make up most of the rock's composition, there can be other substances (like mineraloids, organic matter, or pore space) present in smaller amounts. This aligns with geological understanding that minerals are the principal components, with possible non-mineral additives in minor quantities.

In summary, the statement "Rocks are composed primarily of minerals" reflects the standard concept in geology that rocks are aggregates whose main constituents are mineral species. Exceptions exist for certain mineraloids and non-crystalline components, but these do not negate the general rule for most rocks.

If an answer option were provided, it would likely be labeled as True, acknowledging that while there are exceptions (mineraloids and non-crystalline materials in some rocks), minerals are the predominant constituents in the vast majority of rocks.

Geography CC 1 Sec ON1 (31167) Quiz #8: Units 27-29

Rocks are composed primarily of minerals.

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