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MAGMA
| Pronunciation (US): |  | (GB): | |
Irregular inflected form: magmata
I. (noun)
Sense 1
Meaning:
Molten rock in the earth's crust
Classified under:
Hypernyms ("magma" is a kind of...):
rock; stone (material consisting of the aggregate of minerals like those making up the Earth's crust)
Context examples:
Larger bubbles rise faster through the magma and expand rapidly as the pressure reduces, just like bubbles rising in a glass of fizzy drink; the gas cools down because of the expansion.
(Size matters: if you are a bubble of volcanic gas, The Titi Tudorancea Bulletin)
"Those colors represent different mantle components, and the lines are magmas produced by the components and transported to the surface."
(Earth's mantle looks like a painting, National Science Foundation)
Using the crystal clock method, the researchers were able to model how the composition of the spinel crystals changed over time while the magma was being stored.
(‘Crystal clocks’ used to time magma storage before volcanic eruptions, University of Cambridge)
A new study by University of Wyoming researchers suggests scientists can go back to the past to study present-day solidified magma chambers where the erosion has removed overlying rock, exposing granite underpinnings.
(Supervolcanoes like Yellowstone may have been more active in the past, NSF)
Volcanologists have considered that these chemical changes reflect the rise and fall of magma in the Earth’s crust but the new research reveals that the composition of volcanic gases depends also on the size of the gas bubbles rising up to the surface.
(Size matters: if you are a bubble of volcanic gas, The Titi Tudorancea Bulletin)
De Kleer used the fortuitous detection of this outburst simultaneously at Gemini and the IRTF to show that the eruption temperature is likely much higher than typical eruption temperatures on Earth today, indicative of a composition of the magma that on Earth only occurred in our planet's formative years, she said.
(A Hellacious Two Weeks on Jupiter's Moon Io, NASA)
Calculating the magma storage time also helped the researchers determine how magma can be transferred to the surface.
(‘Crystal clocks’ used to time magma storage before volcanic eruptions, University of Cambridge)
However, more subtle variations across the batholith show that the magma formed by the melting of multiple rock sources that rose through several conduits.
(Supervolcanoes like Yellowstone may have been more active in the past, NSF)
The behaviour of this lava lake alternated between phases of fiery ‘spattering’ powered by large gas bubbles bursting through the magma, and more gentle gas release, accompanied by slow and steady motion of the lava.
(Size matters: if you are a bubble of volcanic gas, The Titi Tudorancea Bulletin)
Researchers from the University of Cambridge used volcanic minerals known as ‘crystal clocks’ to calculate how long magma can be stored in the deepest parts of volcanic systems.
(‘Crystal clocks’ used to time magma storage before volcanic eruptions, University of Cambridge)
