English Sinkhole Cited by user Kent G. Budge on 26 Apr 2021 The formation of sinkholes involves natural processes of erosion or gradual removal of slightly soluble bedrock (such as limestone) by percolating water, the collapse of…
English Guano Cited by user Enwebb on 05 Aug 2019 Guano is the accumulated excrement of seabirds and bats.