The main causes are unburnt corpses that are disposed in the water. ashes also can cause the pollution and bacteria
The wind blows from the subtropical high pressure belt to the equatorial low pressure belt. Where in the northern hemisphere it is known as North East Trade wind.
Belts of high or low air pressure define the horizontal air pressure distribution throughout latitudes. These are the two Subtropical highs, the two Subpolar lows, the two Polar highs, high pressure belt and the Equatorial Low.
After saturation, the air from subpolar low pressure belts becomes dry. As it travels through the upper troposphere towards the poles, this dry air cools. Near the earth's surface, a high pressure belt is created when the heavy, cold air at the poles begins to dissipate.
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So, first of all let me explain the process of hydration to you.
The water causes the hardening of concrete through a process called hydration. Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydrates or hydration products.
Considering this information, the answer is D.
