Formation of Minerals and Soil

Science — Second Preparatory

Common mistakes

Comparison aspect	Main idea	Keywords
Mistake	thinking that a rock is a mineral. Correct: a rock is made of one or more minerals and its chemical composition is not fixed	thinkingrockmineralCorrect
Mistake	thinking that soil is only sand. Correct: soil is a mixture of broken rock organic matter water air and living organisms	thinkingsoilsandCorrect
Mistake	thinking that quartz is softer than calcite. Correct: quartz is higher on Mohs’ scale (rank 7) than calcite (rank 3)	thinkingquartzsoftercalcite
Mistake	thinking that magma that cools quickly forms large crystals. Correct: slow cooling gives large crystals and fast cooling gives small crystals	thinkingmagmacoolsquickly

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