[Bani B]

Here are some causes of water pollution :

– Industrial waste discharge

– Agricultural runoff

– Sewage and wastewater discharge

– Littering and improper waste disposal

– Chemical and hazardous material disposal

– Mining activitie

– Natural disasters such as floods and hurricanes.

Certainly, here are some effects of water pollution in points:

– Reduced availability of clean drinking water

– Harmful effects on aquatic life and ecosystems

– Increased incidence of waterborne diseases

– Damage to fisheries and loss of income for fishermen

– Negative impact on tourism and recreational activities

– Contamination of agricultural land and crops

[Bani B]

1. 9(17-13)/6
=9(4)/6
=36
=6

2. 25+14/(5-3)
=25+14/2
=12.5+7
=19.5

3. 20-3-{7-[2+(4-3)]}
=20-3-{7-[2+1]}
=20-3-{7-3}
=20-3-4
=20-7
=13