Like previous missions, the astronauts took many photos of Earth from the station, over 700 in total, which have been made freely available. These Crew Earth Observations, are intended to record dynamic events on the Earth's surface such as storms, fires, or volcanoes. For example, a photo of 1 January 2001 shows Mount Cleveland, Alaska, with a plume of smoke, prior to its eruption the following month. On 23 January 2001, the crew observed a unique perspective of a plume of volcanic ash coming from Popocatépetl, an active volcano 70 kilometres southeast of Mexico City.