| Answer | Crossword Clue |
|---|---|
| bradyseism | a slow up-and-down movement of the earth's crust |
| bradyseisms | BRADYSEISM, a slow up-and-down movement of the earth's crust |
| subduction | The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate |
| tread | to maintain the body erect in the water with the head above the surface usually by a pumping up-and-down movement of the legs and sometimes the arms |
| bob | move up and down in a short quick movement bob the head |
| bobbing | (of a thing) Make a quick short movement up and down |
| bobbed | (of a thing) Make a quick short movement up and down |
