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Questions and Answers
What type of rock is extrusive?
What type of rock is extrusive?
- Sedimentary
- Metamorphic
- Igneous (correct)
- None of the above
How does extrusive igneous rock form?
How does extrusive igneous rock form?
- By extreme pressure and heat
- By rapid cooling on the Earth's surface (correct)
- By slow cooling beneath the Earth's surface
- By erosion and deposition
Which process forms extrusive igneous rocks?
Which process forms extrusive igneous rocks?
- Deposition of sediments
- Solidification of magma on the Earth's surface (correct)
- Weathering and erosion
- Metamorphism
What characteristic best describes extrusive igneous rocks?
What characteristic best describes extrusive igneous rocks?
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What is the texture of extrusive igneous rocks?
What is the texture of extrusive igneous rocks?
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Which of the following volcanic rocks is an example of an extrusive igneous rock?
Which of the following volcanic rocks is an example of an extrusive igneous rock?
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What is the intrusive equivalent of an extrusive igneous rock formed from the same magma?
What is the intrusive equivalent of an extrusive igneous rock formed from the same magma?
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Which of the following cooling environments is most likely to produce an extrusive igneous rock?
Which of the following cooling environments is most likely to produce an extrusive igneous rock?
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Study Notes
Extrusive Igneous Rocks
- Extrusive igneous rocks form when magma exits the Earth's interior through volcanic eruptions and cools rapidly on the surface.
- The process of solidification occurs quickly, preventing the formation of large crystals characteristic of intrusive rocks.
- Key characteristics of extrusive igneous rocks include a fine-grained texture due to rapid cooling, resulting in small or no visible crystals.
- Common examples of extrusive igneous rocks include basalt and pumice, which form from lava flows and explosive volcanic activity, respectively.
- The intrusive equivalent of an extrusive igneous rock is known as a plutonic rock; for example, basalt's intrusive counterpart is gabbro.
- Volcanic eruptions and lava flows create environments where extrusive igneous rocks are most likely to form, typically near or at the Earth's surface.
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