There Is An Active Volcano In Antarctica
A frozen top layer does not mean that there is no tectonic or other geologic activity going on underneath the surface. Alaska, also a polar region that experiences very extreme weather, is home to many active volcanoes that have been known to erupt in the dead of the coldest winter months.
Mount Erebus, located in Antarctica, is the most southerly active volcano on the planet; it is known as an ultra volcano and has many ice caves because of how the fumes emerging from the volcano have frozen. Other volcanoes in Antarctica include Mount Terra Nova, Mount Bird, Mount Sidley, and Mount Terror.