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Sagot :
-The cores of terrestrial planets are metallic.
-The mantles of terrestrial planets are made of dense rock
A terrestrial planet, earthly planet, or rough planet, is a planet that is composed fundamentally of silicate rocks or metals. Inside the Solar System, the terrestrial planets acknowledged by the IAU are the internal planets closest to the Sun: Mercury, Venus, Earth and Mars. Among astronomers who use the geophysical meaning of a planet, a few planetary-mass satellites - Earth's Moon, Io, and sometimes Europa - may also be considered terrestrial planets; thus might be the rough protoplanet-asteroids Pallas and Vesta. The terms "terrestrial planet" and "earthly planet" are gotten from Latin words for Earth (Land and Tellus), as these planets are, in terms of structure, Earth-like. Terrestrial planets are by and large studied by geologists, astronomers, and geophysicists.
Terrestrial planets have a solid planetary surface, making them substantially not the same as the bigger gaseous planets, which are composed mostly of some blend of hydrogen, helium, and water existing in various physical states.
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