Special Feature — Part 12
How is soil formed?
Soil makes up the ground that covers our planet.
The surface of the earth actually moves slowly in a circular motion over a long period of time — rising to the surface,
sinking to the inside, and then rising to the surface again.
The soil under our feet was created in the middle of the earth's cycle.
Volcanic eruptions and earthquakes also take place during this cycle.
Soil samples provided by Japan Conservation Engineers & Co., Ltd.