| Answer | Crossword Clue |
|---|---|
| NEOCENE | Of a period of the earth's formation. |
| geosynchronous | (of an earth satellite or its orbit) Having a period of rotation synchronous with that of the earth's rotation |
| starburst | A period of intense activity in a galaxy involving the formation of stars |
| starbursts | A period of intense activity in a galaxy involving the formation of stars |
| paleomagnetism | The branch of geophysics concerned with the magnetism in rocks that was induced by the earth's magnetic field at the time of their formation |
| POLARCAP | Icy formation at either extremity of the Earth's axis |
