Where do supporters of the outside in model say earths water originated from?

They believe that Earth's water originated from extraterrestrial sources such as comets which brought water to the planet.

Bonded to meteorites that hit the Earth

Explanation:

The presence of life in the earth can be seen from the evidence of the meteoroids and there other solid objects that hit the earth with all the force ad created larger cavities and huge holes that had the capacity to store water for a longer duration and also developed larger deeps of the ocean bottoms that blasted off by the space by large chunks of rocks.

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.