(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.
What could be planet Earth's biggest water reservoir has been discovered around 400 miles underneath North America, inside mantle rock. Published in the journal Science, researchers from Northwestern University and the University of Mexico say there is evidence of oceans' worth of water tied up deep in the planet's mantle.