GED Science Practice 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which type of rock is limestone mainly composed of based on the text?

Iron

Silica

Calcium

Limestone is mainly composed of calcium. It primarily consists of calcium carbonate (CaCO3), which is formed from the remains of marine organisms, such as coral and shells. This composition not only gives limestone its characteristic properties but also plays a vital role in various geological processes, such as forming sedimentary rocks. The abundance of calcium in limestone makes it an important rock in the study of geology and environmental science, as it is involved in nutrient cycles and can influence soil and water chemistry.

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Magnesium

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