civilization
a well-organized and developed society or community
course
a planned way
depth
a distance below a surface
population
the people who live in a place
impurity
a substance that makes something unclean or polluted
manage
to direct the organization or usage of something
aqueduct
a pipe or channel that carries water
architecture
the style and design of a building
fountain
a structure that sends water up into the air
site
an area or place
sophisticated
very developed and complex
sanitation
the act of keeping an area clean and germ-free