The answer is: guess. Estimate. Like guessing a forecast. Or such.
Explanation:
a Japanese religion dating from the early 8th century and incorporating the worship of ancestors and nature spirits and a belief in sacred power ( kami ) in both animate and inanimate things. It was the state religion of Japan until 1945.
<span>True, however 50% is rather optimistic value, it's probobally more. The main source of water is in the ground and the groundwater gets constantly more contaminated with road salt, oil, gasoline and other chemicals (and as you can see, these are all manmade products).</span>
An Nafud is the correct answer