(ËvÉr bÉl) adj. 1. of or consisting of words: verbal ability. 2. spoken rather than written; oral: verbal communication. 3. concerned with words only, rather than with the ideas, facts, or realities expressed: a purely verbal distinction. 4. corresponding word for word; verbatim: a verbal translation.
Because their hypothesis requires that Earth arose from water-containing materials already present in the inner solar system, it's called the wet-accretion hypothesis. Most of Earth's water has an indigenous origin, says Drake.
Evaporation is when a liquid changes into a gas. Liquid water evaporates to become a gas called water vapor. The sun's heat helps water evaporate and return to the atmosphere. There, it turns from water vapor back into liquid water and forms a cloud. Eventually, this water may return to Earth as rain or snow. In the water cycle, water moves from the land, lakes, and oceans to the atmosphere and back again.