| It happened 252 million years ago, at the boundary of the Permian and Triassic geological ages. |
| So to explain these events it is necessary to examine the entire geological record. |
| All other ages, epochs, and eras are represented by natural evolutionary and geological phenomena. |
| We concentrate on phosphorus as the nutrient that is biolimiting on geological time scales and potentially leaves a complete geological record. |
| The lava from the Undara volcano travelled 164 km to create the longest lava flow from one single vent in modern geological time. |
| Chemical, visible, and geological evidence collected by the Spirit and Opportunity rovers tell us that both landing sites were once wet. |
