| A | B |
|---|
| absolute age | age of rock or fossil. 岩石或化石的年龄 |
| bacteria | 细菌：最早的生物，单细胞 1st forms of life. single-celled; used photosynthesis to make O2. |
| biodiverstiy | different kinds of life on Earth， 地球的不同生物 |
| era | 2nd largest division of time 第二大的地理时间单位 |
| photosynthesis | take in sunlight + CO2 to make O2 + food 光合作用 |
| geologic time scale | timeline of Earth's history 地理时间单位 |
| fauna | animals 动物 |
| flora | plants 植物 |
| fossil | left overs of a plant or animal 化石 |
| fossil record | All the fossils in Earth's history. 化石记录 |
| eon | largest divion of time 最大的地理时间单位 |
| geologic time scale | timeline of Earth's history. |
| Jurassic period | Mostly dinosaurs lived in this period. 侏罗纪 |
| period | the 3rd largest division of time。 第三大的地理时间单位：纪 |
| radiometric dating | You used it to find the absolute age of a rock. 用此测量岩石的年龄 |
| relative age | the age of a rock / fossils compared to other rocks/fossils 岩石的相对年龄（与别的岩石相比） |
| law of superposition | New rocklayers form on top of oder ones. 新岩层在老岩层上。It helps find the relative age of rocks and fossils. |
