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magma
[ mag-muh ]
noun
- Geology. molten material beneath or within the earth's crust, from which igneous rock is formed.
- any crude mixture of finely divided mineral or organic matter.
- Chemistry, Pharmacology. a paste composed of solid and liquid matter.
magma
/ ˈmæɡə; mæɡˈmætɪk /
noun
- a paste or suspension consisting of a finely divided solid dispersed in a liquid
- hot molten rock, usually formed in the earth's upper mantle, some of which finds its way into the crust and onto the earth's surface, where it solidifies to form igneous rock
magma
/ ă′ə /
, or magmas
- The molten rock material that originates under the Earth's crust and forms igneous rock when it has cooled. When magma cools and solidifies beneath the Earth's surface, it forms what are known as intrusive rocks. When it reaches the Earth's surface, it flows out as lava and forms extrusive (or volcanic) rocks.
Notes
Derived Forms
- ˈپ, noun
- magmatic, adjective
Other yvlog Forms
- ·· [mag-, mat, -ik], adjective
- m·پ noun
yvlog History and Origins
yvlog History and Origins
Origin of magma1
Example Sentences
Indeed, the fact that there were so many hot spots spaced so closely together suggests that there is a vast underground magma chamber system.
But unlike lava on the surface, we don’t know very much about the magma below ground, explains Prof Lavallée.
This model pinpointed key structural features -- fault planes, rift zones, and magma chambers -- that drove these changes.
Seismometers placed near the summit have revealed much about Erebus’s shallow magma plumbing.
As magma rises from the mantle to the surface, it releases gases from the deeper portions of the planet.
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Magma Vs. Lava
What’s the difference between magma and lava?
Magma is what molten (melted) rock is called when it’s under the earth’s surface. Lava is what molten rock is called when it flows out of a volcano or volcanic vent.
To be clear, in popular use, magma and lava are essentially different names for the same liquid-hot, charred orange ooze—which name is used depends on whether it is above or below the surface.
However, geologists and volcanologists have their reasons for using the two different terms to distinguish between forms of what is the same substance.
Magma doesn’t always become lava—sometimes it cools and solidifies beneath the earth’s surface. Sometimes, it collects in what’s known as a magma chamber. When it does reach the surface, it flows out as lava. The rock that’s formed when it hardens and cools can also be called lava, though this use of the term is uncommon outside of technical, scientific contexts.
The word lava is perhaps the more well-known of the two because that’s the one we see when volcanoes erupt (or when the floor turns into it).
Here is an example of magma and lava used correctly in the same sentence.
Example: Lava began flowing from the volcano three days after scientists detected movement of magma underground.
Want to learn more? Read the full breakdown of the difference between magma and lava.
Quiz yourself on magma vs. lava!
Should magma or lava be used in the following sentence?
The eruption resulted in a steady flow of _____ from the volcano.
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