A reading question asks: What are 4 techniques archaeologists use for locating sites?

In a student answer, among the dross, this gem glimmers:

“However, more often than not, archaeologists are aided in their search by natural and unnatural forces that uncover hints or chunks of an ancient civilization. ”

I’d like 3 chunks of Ancient Sumeria wrapped in gold foil, please, and a couple aetherial beings to assist with excavations this year.