magma
MAG-muh
ˈmæɡmə
Hot fluid or semifluid material below or within the earth's crust from which igneous rock is formed, especially by solidification upon cooling.
Crucially, magma is underground. Once it erupts, it becomes lava.
The story behind the word. The word "magma" comes from the ancient Greek word "magma," which originally meant "thick unguent" or "paste." This makes a lot of sense when you think about the viscous, semi-liquid nature of molten rock deep within the Earth. It's thick, gooey, and can be squeezed and shaped, much like a paste.
Word relationships
- molten rock: General term, but 'magma' specifies it's underground.
- solid rock: The opposite state of matter.
Commonly confused with
- lava: Magma is molten rock underground, while lava is molten rock on the Earth's surface after it has erupted.
Word family
- magmatic (adjective): Relating to or formed from magma.
Collocations
- molten magma
- rising magma
- magma chamber
- magma flow
Example sentences
- "Pressure from rising magma can cause the ground above a volcano to swell." Explaining volcanic processes.
- "Scientists study the composition of magma to understand the Earth's mantle." Geological study.
Memory hook
'MAG-muh' sounds like 'magma-gnaw,' like a monster gnawing on molten rock underground. Underground paste
When not to use
Do not use for molten rock on the surface.
Fun facts
- Magma can contain dissolved gases, which are released during a volcanic eruption.
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