How many different types of sludge are there?
Septic tank sludge
The term "sludge" is used in different disciplines to mean different things. For example, there is
the muddy gunk on the bottom of a stream or river
slushy ice on the ocean
an agglutination or aggregation of blood cells
There are many different types of scientists because one person could not handle all the information of geology, astrology, and other types of science. Since there are numerous types of sciences, there has to be many different types of scientists, so there are many different scientists because there are many different sciences.