Igneous Rocks
This type of rock forms from the cooling and solidification of magma or lava.
What is an igneous rock?
These rocks generally form from the compaction and cementation of sediments.
What are sedimentary rocks?
These rocks form when existing rocks are changed by heat, pressure, or both.
What are metamorphic rocks?
Magma that reaches Earth’s surface is called this.
What is lava?
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Igneous rocks that form on Earth’s surface and cool quickly are called this.
What are extrusive rocks?
Fossils are most commonly found in this type of rock.
What are sedimentary rocks?
This type of metamorphism occurs over large areas due to intense pressure and heat.
What is regional metamorphism?
This process presses sediments together.
What is compaction?
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Because they cool slowly underground, these igneous rocks have large crystals.
What are intrusive rocks?
Clastic sedimentary rocks are classified using this characteristic.
What is sediment size?
Metamorphism caused by heat from nearby magma is called this.
What is contact metamorphism?
Slow cooling of magma results in crystals that are this size.
What are large crystals?
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This cooling speed causes extrusive igneous rocks to have small or no visible crystals.
What is rapid cooling?
Sedimentary rocks formed from evaporation or chemical processes belong to this group.
What are organic or crystalline (chemical) sedimentary rocks?
This force pushes rocks together and helps change them during metamorphism.
What is pressure?
This process glues sediments together with minerals.
What is cementation?
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This igneous rock feature forms when gas bubbles are trapped in lava.
What is vesicular texture?
Sedimentary rocks made from broken pieces of other rocks are called this.
What are clastic sedimentary rocks?
This can happen to a metamorphic rock if it is exposed to enough heat to completely melt.
What is becoming magma (and then lava if it reaches the surface)?
This term describes rock fragments that are carried and deposited by wind, water, ice, or gravity.
What are sediments?
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