Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Namib Sand Sea' has mentioned 'Rain' in the following places:
Occurrence Sentence Text Source
[2][9] These rivers arise in the interior mountains of Namibia and flow after summer rain storms.
It has less than 10xc2xa0mm (0.39xc2xa0in) of rain annually and is almost completely barren.
Besides rain being scarce, it is also hardly predictable.
The western Namib gets less rain (5xc2xa0mm) than the eastern Namib (85xc2xa0mm).