<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>
There are millions of liters of water contaminated not only with polluted but arsenic, lead, and other toxic metals in the United States. It is dangerous for public health because it contains bacteria, viruses, and parasites capable of causing diseases in the people. As a preventive measure, Americans drink bottled water and not tap water.
Ice was produced using radiation effect by setting out shallow terra cotta rays with just small amount of water. At night when the temperatures were cool while humidity is low the water used to freeze in the morning.the ice formed was collected and stored in caverns
