Magma is a high-temperature, silicate-dominated molten or partially molten substance generated within Earth’s crust and mantle by decompression melting, flux melting, or heat transfer. It consists of a continuous liquid phase containing dissolved volatiles (e.g., H₂O, CO₂, SO₂), suspended crystals, and sometimes entrained xenoliths. Its physicochemical properties—temperature, viscosity, density, and volatile content—are governed by bulk composition (mafic to felsic), pressure, and crystallinity. Magma behaves as a complex multiphase fluid, undergoing differentiation by fractional crystallization, assimilation, and mixing, and on ascent can evolve into eruptible magma that degasses and solidifies to form igneous rocks.
Hundreds of millions of people live in areas that could be affected by volcanic eruptions. Fortunately, clues at the surface, such as earthquakes and ground deformation, can indicate movement within underground magma dikes—sheets ...
Earth Sciences
Apr 30, 2025
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Beneath Yellowstone lies a magma reservoir, pulsing with molten and superheated rock and exsolved gases. Scientists have long known about the chamber's existence, but have yet to precisely locate its uppermost boundary and ...
Earth Sciences
Apr 16, 2025
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A team of geologists at the Chinese Academy of Geological Sciences, the Institute of Space Sciences and the Shandong Institute of Geological Sciences, all in China, has found evidence in soil samples collected from the far ...
Scientists have studied the moon's surface for decades to help piece together its complex geological and evolutionary history. Evidence from the lunar maria (dark, flat areas on the moon filled with solidified lava) suggested ...
Planetary Sciences
Jan 28, 2025
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Rootless cones are small volcanic landforms ranging from several to several hundred meters in diameter, formed by continuous explosions resulting from the interaction between surface lava and water bodies like lakes and rivers. ...
Planetary Sciences
Jan 27, 2025
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A new study explores how variations in Mars' crustal thickness during its ancient history may have influenced the planet's magmatic evolution and hydrological systems. The research, published in Earth and Planetary Science ...
Astrobiology
Dec 19, 2024
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Io does not have a shallow global magma ocean beneath its surface, counter to previous claims, suggests a paper published in Nature.
Planetary Sciences
Dec 12, 2024
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The moon has a global dichotomy, with its near and far sides having different geomorphology, topography, chemical composition, crustal thickness, and evidence of volcanism. To better understand this dichotomy, Professor Xu ...
Planetary Sciences
Nov 15, 2024
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Mount Vesuvius, Krakatoa, Mount St. Helens: Since the formation of Earth approximately 4.5 billion years ago, the convection and release of hot magma in its mantle layer has famously led to some of the deadliest eruptions ...
Planetary Sciences
Nov 14, 2024
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53
Before Earth became the blue planet, it was engulfed by a very different kind of ocean: a vast, deep magma ocean reaching down hundreds or perhaps even thousands of kilometers.
Planetary Sciences
Oct 10, 2024
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