Show Water Hole Is le Dry by Day A curious form of water-hole water iliO W il found iO In n the deserts of western Australia Aus dry by day but yielding an abundant supply of water venter by night The flow of water is preceded by weird hissing and sounds of rushing air On examining one it was found that the water supply occurred In a n long narrow trench at the UL which was a thin plate of gneiss a n species of rock arranged in layers separated by a cavity from the main mala rock mass beneath Apparently the heat of the day causes this plate to expand in the form of a n depression In which the water retreats When ity i it cools and contracts at night it forces first air all and then water back into the I trench j |