| A | B |
|---|
| paleogeography | ancient geography setting of an area |
| passive margin | edge of a continent along which there is no tectonic activity |
| transgression | occurs when sea level rises and causes the shoreline to move inland, resulting in deeper-water deposits overlying shallower-water deposits |
| regression | occurs when sea level falls, causing the shoreline to move seaward, and rsults in shallower-water deposits overlying deeper-water deposits |
| Cambrian explosion | the sudden appearance of a diverse collection of organisms in the Cambrian fossil record |
| indicate | to show |
| subduction | process by which one tectonic plate slips beneath another tectonic plate |
| Cordillera | mountain ranges that formed in western North America during the middle Triassic Period |
| phytoplankton | microscopic organisms at the base of the marine food chain |
| amniotic egg | eggs that contain food and water for a developing embryo |
| iridium | a rare metal in Earth's rock |
| define | to mark a boundary, edge, or limit |
| climate | the average course or condition of the weather at a place |
| Homo sapiens | modern humans |
| bipedal | upright locomotion of humans |
| coincide | to occupy the same place in space or time |
