ANSWERS: 2
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The average rainfall in the outback is about 250mm a year (25cm), according to the Atlas of South Australia. This amount can be as low as 150mm (15cm) in the driest parts of the outback. Source: http://www.atlas.sa.gov.au/go/resources/atlas-of-south-australia-1986/regional-areas/outback, http://www.atn.com.au/sa/south/outbackclimate.htm
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A drop a year :(
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