What are the properties and types of igneous rocks as discussed in the study guide?
Understand the Problem
The question appears to be a study guide for a physical geology exam, covering topics primarily related to igneous rocks and their properties.
Answer
Intrusive and extrusive igneous rocks differ by where they form.
Igneous rocks are categorized as intrusive or extrusive depending on where they form. Intrusive rocks form inside the Earth from cooled magma, while extrusive rocks form on the surface from lava. They are identified by texture, mineral composition, and density.
Answer for screen readers
Igneous rocks are categorized as intrusive or extrusive depending on where they form. Intrusive rocks form inside the Earth from cooled magma, while extrusive rocks form on the surface from lava. They are identified by texture, mineral composition, and density.
More Information
Igneous rocks are primarily divided by where they form. Intrusive rocks like granite cool slowly underground, resulting in large crystals. Extrusive rocks, such as basalt, cool quickly on the surface, forming fine-grained textures.
Tips
Confusing intrusive with extrusive rocks is common; remember that 'intrusive' means formed inside (ground).
Sources
- Encyclopedia: Igneous Rocks - National Geographic - nationalgeographic.org
- Classification of Igneous Rocks - Geosciences LibreTexts - geo.libretexts.org
- Igneous Rocks - Definition, Characteristics, Types - Byju's - byjus.com
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