the earth has 75% of water so where did that come from then .when the earth cooled down . think about it the earth is in a bubble . H2O did not appear over night .
Although water covers around 70-75% of the Earth's surface, water is actually a rare substance that represents just 0.02 - 0.05 % of the Earth's total mass.
H2O did not appear overnight as you correctly stated, it is believed that much of the surface water could have appeared as long ago as 4billion years.
 
Comets is where they hypothesise the water on earth came from.
Though they now believe water could have been present at the formation of the planet.
 
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millions of years ago, there was a Supreme Being who, being bored and fed up with eating cosmic dust and bits of rock, laboured hard and long to eventually create a cheese souffle. Unfortunately, he had the oven on too high and the resulting explosion blasted cheese all over the universe. eventually, pieces of cheese coagulated to form planets,most of which,due to gravity, turned into rock or gas ( these gaseous planets were due to the fact that in 1 of the souffles, he had added heinz beans). the only exception being the moon, which we all know is made of cheese. QED.
 
Not perfectly spherical. Fatter round the equator as the spinning pushes it out.

A bit like a builder after too many times on a merry go round
Said it before I could, as the earth spins the forces that are immense push the middle part out around its axis, hence the slight bulge when you look at distant pictures of earth from space.
 
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Pete999

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Why are the Planets almost round?
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