geologic time scale

例句：

1. 1. The geologic time scale is crucial for understanding the evolution of life on Earth.
   地质时间尺度对于理解地球上生命演化至关重要。
2. 2. The geologic time scale helps us to understand the history of the earth's crust.
   地质时间尺度有助于我们了解地球地壳的历史。
3. 3.The geologic time scale is used to study the distribution and movement of rocks and minerals in the earth's crust.
   地质时间尺度用于研究岩石和矿物在地球地壳中的分布和运动。