 |
| |||
| two-century cycle; two-century solar cycle; 205-year solar cycle; 205-year cycle | |||
| cycle de deux siècles: 5 phrases in 1 subject |
| Earth sciences | 5 |
|
| |||
| two-century cycle; two-century solar cycle; 205-year solar cycle; 205-year cycle | |||
| cycle de deux siècles: 5 phrases in 1 subject |
| Earth sciences | 5 |