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  • Occasionally, a rock is composed of only one mineral. But a crystal of the mineral fluorite in your hand is a stone rather than a rock. Main source:
    66 KB (6,187 words) - 22:19, 26 April 2016
  • igneous rock is formed by the cooling and crystallization of molten rock." Igneous "rocks [are divided] into two broad categories based on where the molten
    46 KB (3,816 words) - 03:14, 24 April 2016
  • erosion of rock, especially a river bed, by rock fragments scratching and scraping it" is called abrasion. The striations in the image on the right on Cerro
    18 KB (1,876 words) - 22:14, 26 April 2016
  • hawaiite. 2. Which chemical phenomenon are associated with the Earth? 3. Yes or No, A rock similar to granite, but containing more plagioclase than
    10 KB (874 words) - 02:54, 15 April 2016
  • Giovanni Pettinato of the University of Rome, a rock crystal lens, currently on show in the British museum, could rewrite the history of science. He
    47 KB (5,042 words) - 12:28, 6 June 2016
  • lecture and an article from the astronomy department. It is under development for possible inclusion in the course on the principles of radiation astronomy
    7 KB (511 words) - 23:59, 22 April 2016
  • olivine rock. Top left is the mineral mica in a rock. Second on the right is an image of Cristobalite spheres within obsidian. Second on the left is an
    141 KB (14,345 words) - 22:45, 22 May 2016
  • arranged one on top of another", a "layer of sedimentary rock having approximately the same composition throughout", or any "of the regions of the atmosphere
    115 KB (13,339 words) - 20:04, 12 July 2016
  • by the rover driving over it. The Mastcam took this image during the 174th Martian day, or sol, of the rover's work on Mars (Jan. 31, 2013). The rock is
    98 KB (11,253 words) - 02:21, 3 July 2016
  • rock underground) and lava (molten rock on the surface)." Def. "molten matter within the earth, the source of the material of lava flows, dikes of eruptive
    80 KB (9,585 words) - 06:08, 15 May 2016
  • geochemistry, and geophysics. Three branches of petrology focus on the three major rock types: igneous petrology, metamorphic petrology, and sedimentary
    81 KB (8,798 words) - 17:15, 6 May 2016
  • A small rock glacier [on the right] with the rock faces that feed it with debris. The steepness of the front suggests the activity of the rock glacier
    124 KB (12,239 words) - 12:10, 5 July 2016
  • The letter k can be doubled with c (like in rock n' roll.) The consonant c sounds like s when not combined with k (like the first c in bicycle). The letters
    9 KB (537 words) - 08:43, 19 September 2015
  • the air by a volcanic eruption that settles on the surrounding areas" is called tephra. "[T]ephra, is a general term for fragments of volcanic rock and
    118 KB (13,117 words) - 11:54, 20 July 2016
  • indicating that the element was only on the very surface of the rock. Magnesium was also slightly enriched on the surface. The heights of the peaks do not
    114 KB (13,053 words) - 22:53, 19 April 2016
  • situ on the rock." At second right is an approximately natural color image of the asteroid 243 Ida. "There are brighter areas, appearing bluish in the picture
    158 KB (18,278 words) - 05:39, 9 July 2016
  • particles. The muons inherit the high energy of the parent cosmic rays, which enables them to penetrate and pass through the rock of the volcano and
    97 KB (12,275 words) - 16:47, 4 July 2016
  • his house upon a rock and the rain descended and the floods came and the blew and beat upon that house and it fell not for it was founded upon a rock these
    58 KB (11,693 words) - 14:45, 9 April 2016
  • helium and methane. The lower layer is liquid hydrogen compounds, oxygen, and nitrogen. It is believed that the planet core comprises rock and ice. Average
    34 KB (3,844 words) - 12:09, 21 May 2016
  • are all the same rock type. The first image at left shows the various shades of grey. The second image at left of gray clay shows the cracking from water
    113 KB (12,058 words) - 00:16, 20 April 2016

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