Thermal pollution is more prevalent near

Which of the following gases does not cause acid rain?

Compressed Natural Gas $(CNG)$ is primarily composed of:

The cause of water bloom is ..........

Identify the colloidal materials present in domestic sewage.

$A$ - Micro-organisms involved in the biodegradation of organic matter in the receiving water body consume a lot of oxygen,and as a result,there is a sharp decline in dissolved oxygen in the stream from the point of sewage discharge.
$R$ - $BOD$ decreases when the dissolved oxygen amount decreases in water.