Rocks to make tools and shelter, ores refined for metals, and aggregate for roads and buildings have all been transported by humans in a deliberate fashion. As the human population has increased to its present 6 billion and counting, the amount of earth materials moved by the world population has also increased. And now, human beings are considered to be a significant geologic agent, changing the morphology or form of the land.
Human beings are geomorphic agents much like rivers, waves, wind and glaciers.
The student should appreciate the many uncertainties in making these estimates. The absence of pyramids from these other cultures does not rule out significant earth movement. Students could generate their own models which give better curve shapes. Note that unintended soil movement associated with erosion of agricultural lands is not included in these data. Unintended mass movement has been about 2-10 times that of intentional earth modification.