GED Science Practice

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Study for the GED Science Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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

Iron
Silica
Calcium
Magnesium

The correct answer is: 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.