What’s it Like at the Centre of the Earth? - Horizon: The Core - BBC Two (by BBC)
http://www.bbc.co.uk/programmes/b0148vph The earth’s inner core is made of iron nickel alloy. But what happens to it under the immense temperatures and pressures found there? Professor Kei Hirose spent 10 years devising an experiment to recreate these extreme conditions. Here he reveals the results…
Major-Element Composition of Mercury Surface Materials (por Lunar and Planetary Institute)
This figure shows the major-element composition of representative rocks and soils from Earth, Moon, and Mars as displayed on a graph of the ratio by weight of aluminum over silicon versus that of magnesium over silicon. The newly measured major-element composition of Mercury’s surface materials are also depicted on the same graph, as measured by the MESSENGER XRS. Mercury has lower Al/Si and higher Mg/Si than typical lunar surface materials and terrestrial basalts, indicating a lower fraction of the common mineral plagioclase feldspar.
Seafloor chimneys are formed by minerals precipitating out of solution when hot hydrothermal fluids mix with cold seawater. The same process creates large, concentrated deposits of precious metals on the seafloor. Photo courtesy of Maurice Tivey and WHOI Deep Submergence Lab, Cruise Manus 2006 with ROV Jason, Woods Hole Oceanographic Institution. (via WHOI)