lease – n. a legal agreement that lets someone use a car, house, etc., for a period of time in return for payment

drill – v. to make a hole in something using a tool or equipment

critical – adj. extremely important

site – n. the place where something is, was or will be located

basin – b. the area of land around a large river and the small rivers that flow into it

archaeological – adj. relating to a science that deals with past human activities by studying the bones, tools and other objects