| Answer | Crossword Clue |
|---|---|
| REEFS | Rock ridges |
| ARETES | Rock-climbers' ridges |
| reefy | abounding in ridges of rock |
| BASALTIC | Like rock found at midocean ridges |
| reefiest | REEFY, abounding in ridges of rock |
| piddocks | A bivalve mollusk that bores into soft rock or other firm surfaces. The valves of the shell have a conspicuous gap between them and rough frontal ridges to aid in boring |
