Granite, sandstone, limestone in the three places, where it is possible to find lava scenic spot, on the grounds that
Granite is an igneous rock, from the earth's crust in the high temperature melt into the condensation, insoluble in water, will not be dissolved in water; sandstone is marine sedimentary quartz sand (Sio2), insoluble in water, will not be water erosion;
Limestone (calcium carbonate CaCo3) has certain water solubility, easy crack dissolution erosion into calcium carbonate rocks, when the solubility reaches saturation due to the decrease of temperature, or moisture evaporation, the supersaturated calcium carbonate solution will be precipitated solid calcium carbonate, the gradual accumulation of the formation of stalactites Karst wonders.
Only have the limestone geology and geomorphology in Karst, it may have a solution (not melting) hole, karst cave, stalactites Karst phenomenon.
