| These granite dikes are composed almost totally of potassium feldspar and quartz. |
| Because of the freeze-and-thaw cycle, concrete dikes tend to require annual maintenance to seal cracks and remain watertight. |
| Dolerite is basaltic magma that solidifies rapidly in sills and dikes near the surface. |
| The need to build dikes was a key factor in causing the early settlers to request status as a municipality. |
| Volunteers have reinforced dikes along the Elbe River and sandbagged their homes and businesses trying to avoid a deluge. |
| Based on the position of the dikes, where was the source of the magma for the laccoliths located? |
