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There are also
currents in the lake in various directions, caused by the continued
prevalence of strong winds, and to their influence we may attribute the
diffusion of finer mud far and wide over great areas; for by numerous
soundings made during Captain Bayfield's survey, it was ascertained that
the bottom consists generally of a very adhesive clay, containing shells
of the species at present existing in the lake.

Word:

attribute

Question:

How do the various currents in the lake, caused by strong winds, contribute to the diffusion of finer mud over great areas?

Answer (optional):

The currents in the lake, caused by strong winds, contribute to the diffusion of finer mud over great areas. The bottom of the lake consists of a very adhesive clay containing shells of the species at present existing in the lake. The prevalence of strong winds also causes currents in various directions, which contribute to the diffusion of finer mud.