A scientist who studies the physical properties of the Earth, including earthquakes, volcanoes, magnetism, and the structure of the Earth's interior.
From geo- (Earth) + physicist (one who studies physics, from Greek physika, 'things of nature'). The term became established in the late 19th century as the field of geophysics developed.
Geophysicists use seismic waves from earthquakes like an ultrasound to 'see' inside the Earth and discovered the liquid outer core—without them, we wouldn't know Earth's interior is partly molten! They're basically doctors for the planet.
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