Where did the water on earth come from?

Answer 1

Possibly from asteroids.

Scholars continue to investigate this.

Scholars have postulated that Earth's water originated from comet ice, and they are also investigating the possibility that Earth's water originated from asteroid ice.

Scientists believe that after those ice-containing comets and asteroids collided with Earth, Earth's water originated from them.

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Answer 2

Lydia Adams

The water on Earth originated from the outgassing of volcanic activity and later supplemented by cometary impacts during the planet's formation.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.