China is the most populated country with over 1.3 million citizens
They make maps
The word "Cartography" comes from the Latin word charta-, meaning "tablet or leaf of paper" and the Greek word graphein, meaning to write or draw.
The resulting erosion at the base of a waterfall can be very dramatic, and cause the waterfall to "recede." The area behind the waterfall is worn away, creating a hollow, cave-like structure called a "rock shelter." Eventually, the rocky ledge (called the outcropping) may tumble down, sending boulders into the stream
Oil spills, trash, dirty water, sewage, pollution, air pollution, drain runoff, fertilizers, spa treatments, household chemicals