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A Hidden Cause of Sinkholes Is Lurking Underground

Season 51 | 2m 21s

Sinkholes can form either really quickly, or really slowly over a long period of time – and they don’t always come with warning signs.

National Corporate funding for NOVA is provided by Carlisle Companies. Major funding for NOVA is provided by the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.
Extras
The Southwest is in a megadrought, but Native Americans have survived them before.
In Northern California, Marine science is guided by Tolowa Dee-ni' Nation’s community and culture.
Using photo archives and ancestral knowledge, witness coastal erosion in Bristol Bay, Alaska.
Ak-chin farming makes desert agriculture possible, and now, those practices help communities today.
Reintroducing the hogan, an earthen Navajo structure that stays cool in the summers without AC.
Following a local Unangax̂ hunter, hear the realities of food access in the changing Arctic.
In the 1980s scientists discovered a crucial part of the Earth’s atmosphere was extremely thin.
Blockbuster drug Ozempic keeps surprising scientists.
Meet the people leading new efforts to shape the future of the Gulf of Maine and our oceans.
Meet the people leading new efforts to shape the future of the Gulf of Maine and our oceans.
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