UNIVERSE
PLANETARY INTERIORS
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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planetary differentiation
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convection currents
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bombardment
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accretion
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Detailed explanation-1: -Space debris pelted Earth in the late heavy bombardment stage (LHB) about 4 billion years ago in the Hadean Eon. To say the least, it was a violent stage in Earth’s geologic history. Asteroids, comets, and space debris pelted our young planet Earth.
Detailed explanation-2: -About 4 billion years ago, the terrestrial planets were bombarded by asteroids following an orbital shake-up of the outer Solar System.
Detailed explanation-3: -Impact craters on the Moon, Earth, and other moons and planets may be evidence of this period of heavy bombardment. Such a period of heavy impacts would have had a significant effect on the evolution of the planets and the development of life on Earth.
Detailed explanation-4: -Early Earth suffered constant threat of attack from leftover planet-building material. From about 4.5 to 3.8 billion years ago, failed planets and smaller asteroids slammed into larger worlds, scarring their surface.
Detailed explanation-5: -A meteorite is a fragment of spatial matter that falls to the surface of a planet. Most meteorites that fall to Earth come from the Asteroid Belt. Watch as a meteorite travels to Earth, causes an explosion, and creates an impact crater.