Why do scientists think that comets from the Kuiper belt may have contributed to Earth's early oceans? View Available Hint(s) Olcy comets now orbiting in the Kuiper belt could have collided with Earth during its formation O Comets in the Kuiper belt produce meteorites that have landed on Earth. Comets vaporize into clouds when they enter the atmosphere, and the clouds produce precipitation O Comets contain hydrogen, which is necessary for making a water molecule. Comets in the Kuiper belt have a molecular signature similar to the water on Earth