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Which of the following is not a rock?
Granite
Limestone
Quartz
Marble
Quartz
Quartz is a mineral composed of silicon dioxide, whereas rocks are aggregate masses of one or more minerals. Granite, limestone, and marble are classified as rocks because they consist of complex mineral assemblages or organic matter, whereas quartz represents a specific chemical compound found as a building block within those rocks.
Quartz is a mineral composed of silicon dioxide, whereas rocks are aggregate masses of one or more minerals. Granite, limestone, and marble are classified as rocks because they consist of complex mineral assemblages or organic matter, whereas quartz represents a specific chemical compound found as a building block within those rocks.
The Earth's crust is composed of igneous, sedimentary, and metamorphic rocks, while minerals like quartz, feldspar, and mica are the fundamental units forming these rock types.
Rocks are naturally occurring solid aggregates of minerals, while minerals have a definite chemical composition.
Granite is an intrusive igneous rock primarily composed of quartz, feldspar, and mica.
Limestone is a sedimentary rock composed mainly of calcium carbonate, often derived from marine skeletal fragments.
Marble is a metamorphic rock formed by the recrystallization of limestone under heat and pressure.
Quartz is one of the most abundant minerals in the continental crust and is classified under the silicate group.
Option A (Granite) is an igneous rock formed from the slow cooling of magma.
Option B (Limestone) is a sedimentary rock formed from chemical or biological processes.
Option D (Marble) is a metamorphic rock that does not contain cleavage and reacts with acid.
C is correct тАФ Quartz is a mineral, not a rock, as it consists of a uniform chemical composition whereas rocks are mixtures of minerals.
When studying Geography, always differentiate between 'Mineral' (definite chemical formula) and 'Rock' (an aggregate), as UPSC and SSC frequently test this distinction in Physical Geography sections.
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