Igneous Rocks Are Formed When Magma or Lava Does What?

Study for the FMS Science Test. Engage with flashcards and multiple-choice questions, each enhanced with hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

Igneous Rocks Are Formed When Magma or Lava Does What?

Explanation:
Igneous rocks form from molten material that cools and hardens into a solid. When magma sits underground, it cools slowly, letting crystals grow larger; when lava erupts at the surface, it cools quickly, producing tiny crystals or a glassy texture. This cooling and solidification is what makes the rock solid and gives it an igneous origin. The other options describe processes for other rock types: erosion and weathering break rocks down; deposition of sediments leads to sedimentary rocks; and heat and pressure transforming existing rocks leads to metamorphic rocks.

Igneous rocks form from molten material that cools and hardens into a solid. When magma sits underground, it cools slowly, letting crystals grow larger; when lava erupts at the surface, it cools quickly, producing tiny crystals or a glassy texture. This cooling and solidification is what makes the rock solid and gives it an igneous origin. The other options describe processes for other rock types: erosion and weathering break rocks down; deposition of sediments leads to sedimentary rocks; and heat and pressure transforming existing rocks leads to metamorphic rocks.

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