Why are volcanoes used to understand Earth’s interior?
Quick Answer
Because magma carries chemical clues from deep inside the planet. By studying erupted lava, gases, and crystals, scientists learn about the mantle and crust below.
The Full Story
Volcanoes act like natural probes into Earth’s interior because they transport material that was stored deep underground. Geochemists analyze lava composition, mineral crystals, and dissolved gases to infer conditions in the mantle and crust. Different volcanic rocks reveal different melting processes, source materials, and storage depths. For example, high-pressure minerals or unusual isotope ratios can show where magma was formed and how it evolved. Volcanic eruptions therefore provide rare direct samples of otherwise inaccessible parts of Earth.
Key Facts
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