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The water cycle refers to the theskfeed steady exchange of water within the hydrosphere, between the ambiance, soil water, surface water, groundwater, and vegetation. Hydrology is the research of the motion, distribution, and high quality of water throughout the Earth. The study of the distribution and movement of groundwater is hydrogeology, of glaciers is glaciology, of inland waters is limnology and distribution of oceans is oceanography. The refractive index of liquid water (1.333 at 20 °C (68 °F)) is far larger than that of air (1.0), similar to these of alkanes and ethanol, but lower than these of glycerol (1.473), benzene (1.501), carbon disulfide (1.627), and common types of glass (1.four to 1.6). The refraction index of ice (1.31) is decrease than that of liquid water. The normal type of ice on the floor of Earth is Ice Ih, a section that forms crystals with hexagonal symmetry. Mental illnesses are the main reason for disability in the US and Canada. Examples include, sch