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Questions and Answers
How are igneous rocks formed?
How are igneous rocks formed?
- Through the metamorphosis of existing rocks
- By the evaporation of water from the Earth's surface
- By the cooling and solidification of magma (correct)
- By the compression of sedimentary rocks
What makes magma rise to the Earth's surface?
What makes magma rise to the Earth's surface?
- It is pushed up by the movement of tectonic plates
- It is exposed to extremely high temperatures
- It is denser than the surrounding rock
- It is less dense and more buoyant than surrounding rock (correct)
Where are melts commonly found?
Where are melts commonly found?
- In sedimentary rock layers
- In the Earth's core
- In the upper atmosphere
- In boundaries between tectonic plates or hot spots (correct)
What conditions are required for rocks to melt and form magma?
What conditions are required for rocks to melt and form magma?
What type of rocks are formed when magma is trapped underneath the surface and slowly cools?
What type of rocks are formed when magma is trapped underneath the surface and slowly cools?
What is the main characteristic of batholiths?
What is the main characteristic of batholiths?
What distinguishes sills from dikes?
What distinguishes sills from dikes?
Which statement best describes the formation of dikes and sills?
Which statement best describes the formation of dikes and sills?
What type of rocks are commonly observed in batholiths?
What type of rocks are commonly observed in batholiths?
What is a notable example of a sill formation mentioned in the text?
What is a notable example of a sill formation mentioned in the text?
What is the main difference between volcanic and plutonic igneous rocks?
What is the main difference between volcanic and plutonic igneous rocks?
What is the main reason for the fine-grained or glassy texture of volcanic rocks?
What is the main reason for the fine-grained or glassy texture of volcanic rocks?
Which mineral is a significant component of pumice, an example of extrusive igneous rock?
Which mineral is a significant component of pumice, an example of extrusive igneous rock?
What is the primary reason why granite, an example of intrusive igneous rock, has a coarse-grained texture?
What is the primary reason why granite, an example of intrusive igneous rock, has a coarse-grained texture?
What is a pluton in the context of igneous geology?
What is a pluton in the context of igneous geology?
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