| Answer | Crossword Clue |
|---|---|
| plutonism | the theory that the earth's crust was formed by volcanoes |
| plutonisms | PLUTONISM, the theory that the earth's crust was formed by volcanoes |
| catastrophism | The theory that changes in the earth's crust during geological history have resulted chiefly from sudden violent and unusual events |
| scarped | line of cliffs formed by the faulting or fracturing of the earth's crust; escarpment |
| scarp | line of cliffs formed by the faulting or fracturing of the earth's crust; escarpment |
| 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 |
