| Answer | Crossword Clue |
|---|---|
| ERA | The time of psychedelic rock music, e.g |
| ERA | The time of soul music, e.g |
| ERA | The time of hair metal music, e.g. |
| headbanging | the act of shaking the head vigorously in time with loud rock music |
| DUO | The Black Keys of rock, e.g. |
| shields | A large rigid area of the earth's crust, typically of Precambrian rock, that has been unaffected by later orogenic episodes, e.g., the Canadian Shield |
| metamorphic | Denoting rock that has undergone transformation by heat, pressure, or other natural agencies, e.g., in the folding of strata or the nearby intrusion of igneous rocks |
