Heatwave in Ireland Reveals Prehistoric Stone Monument

historical-nonfiction:

Thanks to the low rainfall, the outline of this prehistoric stone circle, or henge, was shown in how the crops grew.

Here’s how it works. Moisture lodges in archaeological features a little more than in plain soil. So when a drought hits, the plants directly above the archaeological features get a little more water than the plants not over an archaeological feature.

A drone flying over privately-owned fields is credited with the discovery.