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The Earth is one of nine planets that travel around the sun in the solar system. 1_______. It is the only planet known to support life. 2_______. At first this mass was very cold. 3_______. Heavy metals collected at the center and rocks floated near the surface. After millions of years, the rocks formed a hard crust. 4_______.
Of these planets, the Earth is the third nearest the sun
About 5 billion years ago, a cloud of gas and dust began to condense into a solid mass – the young Earth
But later it was melted by radioactivity
And the oceans and the atmosphere appeared