Chemistry
Physico-chemical characteristics of water in water sources undergo changes due to

Auatic fungi
Evapotranspiration
Effluents
Aquatic macrophytes

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Chemistry
The main use of salt in the diet is to

ease the process of cooking
produce in small amounts the hydrochloric acid required for the digestion of food
increase the solubility of food particles in water
make the taste of food better

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Chemistry
What are the components responsible for acid rain?

Oxides of carbon (COx) and Oxides of nitrogen (NOx)
Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
Carbon dioxide (CO2) and Carbon monoxide (CO)
Nitrogen monoxide (NO) and Carbon monoxide (CO)

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