Portal:Earth sciences/DYK/1

...that Ojos del Salado (pictured) is the highest volcano on Earth?
...that the Toronto Magnetic and Meteorological Observatory was originally built to study fluctuations in Earth's magnetic field?
...that Atlantic hurricane reanalysis is an ongoing project within the National Oceanic and Atmospheric Administration which seeks to correct and add new information about past Atlantic tropical cyclones?
...that Robert Case, a National Weather Service meteorologist, dubbed the 1991 Halloween Nor'easter "The Perfect Storm"?
...that the 1912 Novarupta eruption of Mount Katmai was the largest of the 20th century?
... that the North geomagnetic pole is not the same as the magnetic North Pole, and that a compass points at neither?