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the process or system by which water or waste liquid flows away
- We need a plan to improve the town's drainage system.
- Geologists believe that Crater Lake was once part of a towering volcanic mountain.
- The availability of archeological evidence for study is dependent on the natural conditions in which the archeological remains are found, ...
... archeologists have been focusing more on wet sites, which are proving to be rich sources of evidence about lifestyle and activities of past human cultures.
- wealthy - substiantial
- properous - probable
to become worse
- ... organic finds, and wood in particular, deteriorate rapidly when they are removed from the wet environment and begin to dry out.
the huge cost of wetland archeology, which has been estimated to be quadruple the cost of dry land archeology.
- 4 times
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