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And it is similarly just a naming convention with the meteor* things: https://spaceplace.nasa.gov/asteroid-or-meteor/en/ and https://solarsystem.nasa.gov/asteroids-comets-and-meteors/meteors-and-meteorites/in-depth/ Regardless of its composition, when it breaks off from an asteroid or comet, as long as it is in space it is a meteoroid. When it hits the ...


For magma and lava it's liked you said: "magma" is used under the surface, "lava" above. See for instance the definition of USGS Volcano Hazard Program's glossary: Lava: General term for magma (molten rock) that has been erupted onto the surface of the Earth and maintains its integrity as a fluid or viscous mass, rather than exploding into fragments. Now,...

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