| A | B |
|---|
| propels | v. to push or drive forward |
| diversity | n. difference; unlikeness; variety |
| alternate | v. to follow by turns; to take; n. a substitute; adj. substitute |
| tributary | n. a small stream flowing into a larger one; owed or paid as tribute; contributory |
| universal | adj. present everywhere; unlimited; that can be used for many different kinds, sizes, and so on |
| inquisitive | adj. inclined to ask questions; curious |
| glacial | adj. of or like ice or glaciers; freezing; cold and unfriendly; moving as slowly as a glacier |
| unpredictable | adj. surprising; not predictable; tending to act in unexpected ways |
| barren | adj. sterile; infertile; unable to reproduce; unproductive; empty; dull |
| encounter | v. to meet, usually unexpectedly; to face in battle or conflict; n. a meeting |
