रासायनिक उर्वरकों का अत्यधिक उपयोग मुख्य रूप से किस कारण से मृदा प्रदूषण का कारण बनता है?

If sewage water with a very high BOD is directly discharged into a river, the most immediate consequence would be:

Which combination of pollutants is primarily associated with raw, untreated domestic sewage discharge?

What is the primary ecological consequence of thermal pollution caused by discharging heated industrial effluents into natural water bodies?