Water came to Earth from one of 2 sources. They are (on Earth), and (from space).

Most of Earth's water did come from asteroids, but some also came from the solar nebula. As Wu noted: For every 100 molecules of Earth's water, there are one or two coming from the solar nebula.

Explanation:

I don't know if this correct but u welcome!!!

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

that scientist would be robert hooke