| Similarity | Rank | |
|---|---|---|
| Ice_Age | 0.783 | 78392 |
| [number]_million_year_ago | 0.698 | 80067 |
| glacial | 0.645 | 77210 |
| ice_sheet | 0.644 | 43576 |
| volcanic_activity | 0.628 | 80643 |
| volcanic_eruption | 0.608 | 55368 |
| sea_level | 0.607 | 24215 |
| climatic_change | 0.606 | 79774 |
| permafrost | 0.606 | 53433 |
| glacier | 0.604 | 9427 |
| prehistoric | 0.589 | 40720 |
| global_warming | 0.587 | 5979 |
| million_of_year | 0.585 | 47068 |
| human_evolution | 0.583 | 82895 |
| warming | 0.581 | 15011 |
| dinosaur | 0.579 | 10877 |
| global_temperature | 0.579 | 87576 |
| Jurassic | 0.575 | 97947 |
| solar_activity | 0.574 | 98984 |
| cataclysm | 0.574 | 67890 |
| ice_core | 0.568 | 98081 |
| prehistory | 0.559 | 81951 |
| Neanderthal | 0.557 | 52195 |
| temperature_change | 0.555 | 60745 |
| lava_flow | 0.555 | 93428 |