ABCs from Space: P

What begins with P? Plumes from Pavlof. Plate tectonics, polynyas, and pumice in pyroclastic flows. Paris and Perth. The powerful push of water polishing pebbles as it passes permafrost along the Mackenzie River.

On August 4, 2005, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) sensor on the Terra satellite captured this false-color image of the Mackenzie River Delta in Canada.