Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science Practice test

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Prepare for the Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science exam. Utilize flashcards and multiple-choice questions with hints and explanations to succeed in your certification.

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What are igneous rocks primarily formed from?

Molten magma
Layered sediments
High-pressure conditions
Organic remains

The correct answer is: Molten magma

Igneous rocks are primarily formed from molten magma that cools and solidifies. This process occurs either below the Earth's surface, where the cooling is slower and results in larger crystals (intrusive igneous rocks), or above the surface, following volcanic eruptions, where the cooling is rapid and produces smaller crystals (extrusive igneous rocks). The composition of the magma, which includes various minerals, ultimately influences the characteristics and types of igneous rocks created. The other options focus on different geological processes that are not related to the formation of igneous rocks. Layered sediments refer to the formation of sedimentary rocks, while high-pressure conditions are typically associated with the metamorphosis of existing rocks into metamorphic rocks. Organic remains are the precursors of coal and some types of sedimentary rocks, emphasizing the biological aspect rather than the magma-related formation of igneous rocks.