The sulfide content of bottom sediments is one of the most important environmental indexes.

底质中的硫化物含量是一项重要的环境指标。

youdao

Alex Wolfe and colleagues have sampled and chemically analysed the layers of sediments at the bottom of lakes in high alpine zones and the Arctic.

BBC: Leaving our mark: Fossils of the future

The fundamental role of bottom currents in the construction of continental margins has now been well documented and the sediments deposited or significantly affected by these bottom currents are known as contourites.

UNESCO: EARTH SCIENCES FOR SOCIETY