Which is the best reason that a geologist might carry a small dropper bottle filled with hydrochloric acid when doing fieldwork?

When studying the calumet region of illinois and indiana alfred meyers noted four stages of development as new groups occupied this land in stage 2 farmers used the land primarily to grow food for their familes and their small communities

Where would you be most likely to find a freshet?

In the diagram below dab and dac are adjacent angles