| A | B |
|---|
| congregate | to assemble; to come together in a crowd or mass |
| delicate | easily damaged or injured; fragile |
| harbor | part of a body of water near the shore that offers ships protection from wind and waves, hence, any refuge |
| phosphorescence | the giving off of light without heat; light generated from living organisms |
| tremble | to shake, shiver, or quiver |
| concentration | state of being gathered around a common center |
| soar | to fly upward; to rise or ascend |
| surface | the outside of a thing; the top of a body of water |
| swirl | a whirling or twisting motion |
| principal | highest in rank or importance; foremost; chief; main |
