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Questions and Answers
Which type of rock forms from cooling magma?
Which type of rock forms from cooling magma?
- Plutonic rock
- Igneous rock (correct)
- Metamorphic rock
- Sedimentary rock
What is lava?
What is lava?
- A type of sedimentary rock
- A type of metamorphic rock
- A type of plutonic rock
- Magma that erupts onto Earth’s surface (correct)
What determines the type of rock that forms as minerals cool and crystallize?
What determines the type of rock that forms as minerals cool and crystallize?
- The chemical composition of the magma (correct)
- The temperature of the magma
- The color of the magma
- The viscosity of the magma
What are intrusive igneous rocks called when they cool and solidify beneath the surface?
What are intrusive igneous rocks called when they cool and solidify beneath the surface?
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What happens to the size of crystals in intrusive igneous rocks when the cooling process is slow?
What happens to the size of crystals in intrusive igneous rocks when the cooling process is slow?
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Study Notes
Igneous Rock Formation
- Igneous rocks form from the cooling and solidification of magma or lava.
- Lava is molten rock that reaches the Earth's surface, typically through volcanic eruptions.
Factors Affecting Rock Formation
- The type of rock that forms as minerals cool and crystallize is determined by the chemical composition of the magma and the cooling rate.
Intrusive Igneous Rocks
- Intrusive igneous rocks are formed when magma cools and solidifies beneath the Earth’s surface.
- These rocks typically have a coarse-grained texture due to slow cooling, allowing larger crystals to form.
Crystal Size in Intrusive Igneous Rocks
- The size of crystals in intrusive igneous rocks increases when the cooling process is slow, giving them time to grow larger before solidifying.
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