A rock is a solid, naturally occurring, cohesive substance composed of minerals or mineral-like materials.
A rock is a dense mass of mineral grains that have grown or been cemented together over time. There are big rocks and little rocks. Pebbles are little rocks. One or more minerals can be found in every rock. According to how they were formed, rocks are categorized by geologists (those who study rocks and minerals).These aggregates often form recognizable and mappable volumes and are the fundamental component of the solid Earth.
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