진흙이나 점토가 굳어 형성된 미세한 입자의 퇴적암으로, 얇은 층으로 잘 갈라지는 성질이 있는 암석.
A fine-grained sedimentary rock formed from the compaction of silt and clay mineral particles that can be easily split into thin layers.
예문:
"The layers of shale contained well-preserved fossils of ancient plants."
"Recent technological advancements have made it easier to extract natural gas from shale formations."
"Unlike sandstone, shale is brittle and tends to break into thin, flat slabs."