Question Video: Determining Which Factors Affect the Formation of Metamorphic Rocks | Nagwa Question Video: Determining Which Factors Affect the Formation of Metamorphic Rocks | Nagwa

Question Video: Determining Which Factors Affect the Formation of Metamorphic Rocks Science • First Year of Preparatory School

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During the formation of metamorphic rocks, which of the following affects the conversion of an old rock into another rock? [A] The mass of the magma [B] The temperature of the magma [C] The type of rock that surrounds the magma [D] All of the answers are correct

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Video Transcript

During the formation of metamorphic rocks, which of the following affects the conversion of an old rock into another rock? (A) The mass of the magma, (B) the temperature of the magma, (C) the type of rock that surrounds the magma, or (D) all of the answers are correct.

Metamorphic rocks are formed from the conversion of existing rock to a new type of rock, due to its exposure to high temperature and high pressure. As we can tell from the answer choices, magma is important for the formation of metamorphic rocks. Magma permeates through rock and increases its temperature, causing the rock to undergo a physical change. This aligns with the definition of metamorphic rocks, which states that exposure to high temperature forms metamorphic rocks. The definition also tells us that high pressure is required. The pressure is created by the mass of the magma.

The increase in pressure created by the mass of the magma and the increase in temperature allows metamorphic rock to form. But the type of rock formed depends on the identity of the original rock surrounding the magma. For example, only limestone forms marble.

We can now tell that the mass and temperature of the magma as well as the rock that surrounds it affect the formation of metamorphic rock. Thus, the factors that affect the conversion of an old rock into another rock is answer choice (D): all of the answers are correct.

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