C3
Lesson Summary
Vocabulary Link
- texture
- intrusive igneous rock
- extrusive igneous rock
- plutonic igneous rock
- volcanic igneous rock
- compaction
- cementation
- clastic sedimentary rock
- chemical sedimentary rock
- organic sedimentary rock
- contact metamorphism
- regional metamorphism
- foliated rocks
- nonfoliated rocks
- Igneous rocks are classified by their texture.
- Intrusive igneous rocks are formed under the Earth’s surface, while extrusive igneous rocks are formed on the Earth’s surface.
- Sedimentary rocks are formed by two processes: compaction and cementation.
- Sedimentary rocks are classified on the basis of how they are formed: from other rock particles, from dissolved minerals, or from organic remains.
- Metamorphic rocks are formed by localized exposure to heat from nearby magma, or from large scale interactions involving intense heat and pressure.
- Metamorphic rocks are classified by texture into foliated rocks that have bands of minerals, and into nonfoliated rocks that do not possess bands of minerals.