solidified
21History of Africa — Pre Colonial African States …
22History of South Africa — This article is part of a series General periods …
23List of Tesla patents — Below is a list of Tesla patents. Dr. Nikola Tesla was an inventor who obtained around 300 patents [Snezana Sarbo, [http://www.tesla symp06.org/papers/Tesla Symp06 Sarboh.pdfNikola Tesla s Patents] , Sixth International Symposium Nikola Tesla,… …
24Mount Mazama — collapsed a large caldera, which was later filled with Crater Lake. Elevation 8,159 ft …
25Sand casting — Sand casting, also known as sand molded casting, is a metal casting process characterized by using sand as the mold material. It is relatively cheap and sufficiently refractory even for steel foundry use. A suitable bonding agent (usually clay)… …
26Geology of the Death Valley area — The exposed geology of the Death Valley area presents a diverse and complex story that includes at least 23 formations of sedimentary units, two major gaps in the geologic record called unconformities, and at least one distinct set of related… …
27Electric arc furnace — An electric arc furnace (EAF) is a furnace that heats charged material by means of an electric arc. Arc furnaces range in size from small units of approximately one ton capacity (used in foundries for producing cast iron products) up to about 400 …
28Granteed — The Granteed is a fictional robot in the Super Robot Wars series. It has appeared as a playable unit in Super Robot Wars Judgement only. AppearanceThe Granteed sports a bulky, armored build, and is adorned with fin like or wing like protrusions.… …
29Gold in California — became highly concentrated there as the result of global forces operating over hundreds of millions of years. Volcanoes, tectonic plates and erosion all combined to concentrate billions of dollars worth of gold in the mountains of California.… …
30Geology of Mars — Mars   Mars as seen by the Hubble Space Telescope Designations …
