There is a continuous flow of energy within the earths system

Energy flows on the Earth. ... 30% of this solar energy is reflected, and the remaining 70% moves in different forms and pathways. The majority of the energy that the Earth receives is from the Sun, only 0.03% comes from other sources (as seen in Figure 1). This makes the solar flow the most dominant energy flow

2,407.2 miles. or 32 hours.

question

which are human systems?

the amazon rain forest

the appalachian trail

the george washington bridge

the himalayas

the hoover dam

the north american free trade agreement