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Graphics Interchange Format  |  2002-03-11  |  29.4 KB  |  400x289  |  8-bit (122 colors)
   ocr: Major lava tube flow Low shield' "C" with pit crater Low shield "B" Riftzone Buried low Fissure-red shield flow Low shield "A" with steep summit cone Tension ractures BlOcK diagram showing shield volcanoes, lava tubetiows and fissure fows (after Greeley,1981).