341 origin of planet earth (also see pp. 55-58 in book) a.stellar explosion b.spinning nebular cloud...
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Origin of Planet Earth(also see pp. 55-58 in book)
A. Stellar explosionB. Spinning nebular
cloudC. Gravitation of dust
particles and gasesD. Further collision and
aggregation of proto-planets
E. True planets form about 4.6 billion years ago