petrologic

例句：

1. 1. Petrology is the study of rocks and minerals.
   岩石学是研究岩石和矿物的学科。
2. 2. The petrologist examined the fossils found in the cave.
   这位古生物学家检查了洞穴中发现的化石。
3. 3. The petrological analysis revealed that the rock was formed over 500 million years ago.
   岩石学分析显示，这种岩石是在5亿年前形成的。